diff --git a/.github/workflows/integration.yml b/.github/workflows/integration.yml
index 15b9696ac..1bb859920 100644
--- a/.github/workflows/integration.yml
+++ b/.github/workflows/integration.yml
@@ -10,21 +10,25 @@ permissions:
   contents: read
 
 jobs:
-  # The suite outgrew a single runner, and then a half-suite outgrew a slow
-  # one: two shards cleared in ~14 minutes on a quiet day, but with six pull
-  # requests running side by side the larger shard hit the same 25-minute
-  # guard the split was meant to escape. Three shards keep the biggest slice
-  # around 60 files, which clears the guard with real headroom even on the
-  # slowest runner observed. Each shard boots its own Postgres testcontainer;
-  # the timeout stays a hang detector, not a performance budget.
+  # The suite outgrew a single runner, then a half-suite outgrew a slow one,
+  # and then a third of it did too. Three shards of about 68 files cleared in
+  # 13 minutes on an ordinary runner, but a slow runner day ran every test at
+  # twice its usual duration and the first shard was still working through
+  # its list when the 25-minute guard cut it off: three of four pushes to main
+  # between 2026-08-31 and 2026-09-01 failed that way, with green tests logged
+  # up to the last second. Four shards keep each slice around 50 files, and
+  # the guard sits at three times the ordinary run rather than under two. A
+  # wedged test still surfaces through vitest's own 60-second budget, so the
+  # job timeout only needs to catch a container that never boots. Each shard
+  # boots its own Postgres testcontainer.
   shard:
     runs-on: ubuntu-latest
-    timeout-minutes: 25
+    timeout-minutes: 40
     strategy:
       fail-fast: false
       matrix:
-        shard: [1, 2, 3]
-    name: integration shard ${{ matrix.shard }}/3
+        shard: [1, 2, 3, 4]
+    name: integration shard ${{ matrix.shard }}/4
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
@@ -44,7 +48,7 @@ jobs:
       # vitest a stray positional argument and the shard flag never applies —
       # both "shards" then run the full suite. Proven by a paired local run
       # before this workflow shipped.
-      - run: pnpm exec vitest run --config vitest.integration.config.mts --shard=${{ matrix.shard }}/3
+      - run: pnpm exec vitest run --config vitest.integration.config.mts --shard=${{ matrix.shard }}/4
         env:
           # The integration suite boots a Postgres testcontainer and points
           # Prisma at it via DATABASE_URL set inside `tests/integration/setup.ts`.
@@ -60,7 +64,7 @@ jobs:
           SESSION_SECRET: "integration-tests"
 
   # Branch protection requires a check named exactly "integration". This job
-  # carries that name and answers for both shards: it fails when any shard
+  # carries that name and answers for every shard: it fails when any shard
   # failed or was cancelled, so a half-green matrix cannot satisfy the gate.
   integration:
     runs-on: ubuntu-latest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e1a77033..f34b1ac0d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,13 +1,14 @@
 # Changelog
 
-## [Unreleased]
+## [1.38.1] — 2026-09-01
 
-You can push readings in from your own hardware again.
+You can push readings in from your own hardware again, and a lab reading
+shows where it sits against its reference range at a glance.
 
-Since v1.30.17 there was no way to do it. That release made API tokens
-enforce their scope, which closed a real hole — a token issued for
+Since v1.30.17 there was no way to push a reading in. That release made API
+tokens enforce their scope, which closed a real hole (a token issued for
 medication intake had been reaching every other endpoint, the full backup
-export included — and removed the generic "create API token" button along
+export included) and removed the generic "create API token" button along
 with it. What went unnoticed was that the button had been the only
 self-service route to a token that could write a measurement. A scale or a
 watch bridge piped through Home Assistant had no door left, and the OAuth
@@ -17,19 +18,31 @@ There is now a token for exactly that job, and for nothing else.
 
 ### Added
 
-- **A measurement ingest token, minted from Settings → API & Tokens.** It
-  posts readings to `/api/measurements` and `/api/measurements/batch`, on
-  your own record. That is the whole list. It cannot read a reading back,
-  cannot change or delete one, cannot reach the export, and cannot mint
-  another token — so a credential sitting in a container you did not write
-  has a worst case of junk in your own record, not your health history
-  leaving the building. Shown once, expires after a year, and revoked from
-  the same page as every other token.
+- **A measurement ingest token, minted from Settings → API & Tokens.**
+  Contributed by @Antiheld86 in #881, from their proposal in #878. It posts
+  readings to `/api/measurements` and `/api/measurements/batch`, on your own
+  record. That is the whole list. It cannot read a reading back, cannot
+  change or delete one, cannot reach the export, and cannot mint another
+  token, so a credential sitting in a container you did not write has a
+  worst case of junk in your own record, not your health history leaving
+  the building. Shown once, expires after a year, and revoked from the same
+  page as every other token.
 - **A guide for wiring one up**, with a worked Home Assistant
   `rest_command` and automation, the measurement types a scale or a watch
   bridge tends to report, and what each error response means.
 - The API endpoint list on that settings page now shows the two ingest
   endpoints alongside the medication one.
+- **A reference-range bar beside every lab reading**, contributed by
+  @TimonBed in #860 and #880. The lab list, its mobile cards and the history
+  table on an analyte's page carry a compact bar: the reference window in
+  green, the reading as a marker on it, blue below the window, amber above
+  it. A range with only a minimum or only a maximum gets a bar too, with
+  the one stated bound labelled. A reading far outside its window (vitamin
+  D at 7 against a floor of 30, say) widens the bar's scale so the marker
+  stays visible instead of sitting pinned to the edge. In the list the status badge, the bar and the trend
+  sparkline line up in columns across rows, and every point on the
+  sparkline takes the colour the bar gives it. A qualitative reading, or one
+  without a range, shows no bar.
 
 ### Changed
 
@@ -43,18 +56,80 @@ There is now a token for exactly that job, and for nothing else.
   have: the checkpoint records that your phone delivered what it was
   holding, and a scale advancing it could make the phone skip a window of
   its own samples.
+- The below-range and above-range badges on a lab reading carry a light
+  tint (blue below, amber above) instead of the neutral grey they shared;
+  in range stays neutral. Part of #860.
+- Routine dependency updates: the Prisma Postgres adapter to 7.10.0 (see
+  Fixed), and the Argon2 binding, the WebAuthn server library, Radix,
+  Lucide, the form resolvers and the dev tooling by a patch or minor each.
+
+### Fixed
+
+- Settings, Integrations: the warning that the configured OAuth callback
+  origin differs from the address you are browsing on, added in v1.38.0,
+  never appeared in the published image, and the copyable callback address in
+  each setup guide showed only a path. Both read the app address inside the
+  browser bundle, where it is fixed at build time and the published image is
+  built without it. Both values now come from the server at request time and
+  reflect the `NEXT_PUBLIC_APP_URL` or `*_REDIRECT_URI` you actually set. A
+  structural test refuses a client module that reads that variable again.
+- Lab OCR with a GPT-5 model on the OpenAI provider path (your own key or
+  the operator's admin key), fixed by @TimonBed in #861. The list of models
+  the app trusts to read an image stopped at `gpt-4o`, `gpt-4.1`,
+  `gpt-4-turbo` and the full o-series, so a GPT-5 model was judged unable
+  to read a photo and never sent one; the Codex path already knew better.
+  The extraction call's completion budget doubles from 4000 to 8000 tokens,
+  because a GPT-5 model spends part of it on reasoning and a dense report's
+  JSON was being cut off before the last row. And when the provider itself
+  fails, the error now says so ("The configured AI provider could not
+  process this report") and the server log carries the upstream status,
+  model and error excerpt, where it used to blame the photo and ask for a
+  clearer one.
+- A lab report imported as a document could leave a reference window whose
+  floor sits above its ceiling on the record. The bounds come from the
+  extraction: when a report prints no range text, the two numbers the model
+  reported are the whole of the window, and a transposed pair (100 as the
+  low bound, 30 as the high) went through unchecked. Manual entry, the OCR
+  path and the biomarker endpoint all refuse such a pair; the document path
+  did not, and when the analyte was new to the record the pair was also
+  written to its freshly minted catalog marker, so every later reading of
+  that analyte was judged against a window that cannot be true. The pair is
+  now dropped rather than swapped, because a transposed range says the
+  transcription is wrong and not which of the two numbers is; the verbatim
+  range text survives, so nothing the report actually printed is lost. The
+  extraction drops it, editing a staged fact on the review screen refuses
+  it with the same message the lab forms use, and confirming a fact drops
+  it as the last gate, which is what covers facts staged before this rule
+  existed. Counted as `labs.referenceRange.transposed` in the wide events.
+  The trend sparkline had read the same pair as a minimum-only range and
+  painted a high value green; it now shows a neutral point, as the range
+  bar next to it already showed nothing (#882).
+- Bumping the Prisma Postgres adapter to 7.10.0 broke the image build on
+  both architectures, before any release carried it, with
+  `Cannot find module '/app/node_modules/pg/lib/index.js'`. `pg` had sat in
+  devDependencies, and the assertion that the standalone image can resolve
+  it (pg-boss loads it by plain Node resolution) had passed only because our
+  pin and the adapter's happened to agree on a version; the bump moved the
+  adapter's copy to 8.23.0 while ours stayed at 8.22.0, the file tracer
+  packed only the adapter's copy, and the top-level link pointed at the
+  other. `pg` is a runtime dependency now and the lockfile carries one copy,
+  so the two cannot drift apart on the next adapter release (#872).
 
 ### Security
 
+- `mysql2` is pinned past GHSA-3f6p-5ww8-9rcr (an auth-plugin downgrade
+  that leaks the credential) in both the application tree and the separate
+  Prisma CLI install inside the image. It reaches the tree only through
+  Prisma's MySQL driver, which this app never opens.
 - The token is confined to your own record. Pointing it at a record
   somebody has shared with you is refused, and refused before the sharing
-  grant is even consulted — so no future change to what sharing permits can
+  grant is even consulted, so no future change to what sharing permits can
   widen what one of these tokens reaches.
 - Minting one requires being signed in on the web. No API token can mint
-  another, whatever it is allowed to do — the sign-in a phone holds lasts a
-  day and what it could mint here lasts a year, so allowing it would let a
-  credential that leaked for an afternoon leave behind one that outlives
-  cancelling it.
+  one of these, whatever it is allowed to do: the sign-in a phone holds
+  lasts a day and what it could mint here lasts a year, so allowing it would
+  let a credential that leaked for an afternoon leave behind one that
+  outlives cancelling it.
 - Closed a narrower gap found while building this. A repeated request
   carrying an `Idempotency-Key` could be answered from the cache after a
   check that asked only whether a sharing grant was live, and not which
diff --git a/Dockerfile b/Dockerfile
index 810746d9c..f62b66d3b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -195,6 +195,7 @@ RUN mkdir -p /opt/prisma-cli && \
     cd /opt/prisma-cli && \
     npm init -y && \
     npm pkg set 'overrides.deepmerge-ts=^8.0.0' && \
+    npm pkg set 'overrides.mysql2=^3.22.0' && \
     npm install --omit=dev prisma@7.8.0 @prisma/engines@7.8.0 tsx@4.23.1 dotenv@17.4.2 && \
     ln -sfn /opt/prisma-cli/node_modules/.bin/tsx /usr/local/bin/healthlog-tsx && \
     ln -sfn /opt/prisma-cli/node_modules/dotenv /app/node_modules/dotenv && \
diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index cb4298b0b..8889ef682 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.38.0
+  version: 1.38.1
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.
 
diff --git a/package.json b/package.json
index a9dbb750f..1e2905bb5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.38.0",
+  "version": "1.38.1",
   "description": "Self-hosted personal-health-tracking PWA with Withings integration, AI insights, and doctor-report PDF export.",
   "license": "PolyForm-Noncommercial-1.0.0",
   "homepage": "https://healthlog.dev",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8833fa5a7..3423fa752 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -15,6 +15,7 @@ overrides:
   fast-uri@<3.1.5: ^3.1.5
   flatted@<3.4.2: ^3.4.2
   js-yaml@>=4.0.0 <4.3.1: ^4.3.1
+  mysql2@<3.22.0: ^3.22.0
   minimatch@<3.1.4: ^3.1.4
   ip-address@<10.3.1: ^10.3.1
   sharp@<0.35.0: ^0.35.3
@@ -57,7 +58,7 @@ importers:
         version: 7.10.0
       '@prisma/client':
         specifier: ^7.8.0
-        version: 7.8.0(prisma@7.8.0(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3))(typescript@6.0.3)
+        version: 7.8.0(prisma@7.8.0(@types/node@26.1.1)(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3))(typescript@6.0.3)
       '@simplewebauthn/browser':
         specifier: ^13.3.0
         version: 13.3.0
@@ -126,7 +127,7 @@ importers:
         version: 12.27.0
       prisma:
         specifier: ^7.8.0
-        version: 7.8.0(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3)
+        version: 7.8.0(@types/node@26.1.1)(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3)
       qrcode:
         specifier: ^1.5.4
         version: 1.5.4
@@ -4166,10 +4167,6 @@ packages:
   defu@6.1.7:
     resolution: {integrity: sha512-7z22QmUWiQ/2d0KkdYmANbRUVABpZ9SNYyH5vx6PZ+nE5bcC0l7uFvEfHlyld/HcGBFTL536ClDt3DEcSlEJAQ==}
 
-  denque@2.1.0:
-    resolution: {integrity: sha512-HVQE3AAb/pxF8fQAoiqpvg9i3evqug3hoiwakOyZAwJm+6vZehbkYXZ0l4JxS+I3QxM97v5aaRNhj8v5oBhekw==}
-    engines: {node: '>=0.10'}
-
   depd@2.0.0:
     resolution: {integrity: sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==}
     engines: {node: '>= 0.8'}
@@ -4856,10 +4853,6 @@ packages:
     resolution: {integrity: sha512-eKCa6bwnJhvxj14kZk5NCPc6Hb6BdsU9DZcOnmQKSnO1VKrfV0zCvtttPZUsBvjmNDn8rpcJfpwSYnHBjc95MQ==}
     engines: {node: '>=18.18.0'}
 
-  iconv-lite@0.7.2:
-    resolution: {integrity: sha512-im9DjEDQ55s9fL4EYzOAv0yMqmMBSZp6G0VvFyTMPKWxiSBHUj9NW/qqLmXUwXrrM7AvqSlTCfvqRb0cM8yYqw==}
-    engines: {node: '>=0.10.0'}
-
   iconv-lite@0.7.3:
     resolution: {integrity: sha512-IKXpvIzjnC9XTAUbVBcMfGS0EPaIXtW6v+zr+RRp+hqULEpo0owZax6wyRwPOJbWbzjYspQwusTsfVr0ifh4uQ==}
     engines: {node: '>=0.10.0'}
@@ -5572,9 +5565,11 @@ packages:
     resolution: {integrity: sha512-dkEJPVvun4FryqBmZ5KhDo0K9iDXAwn08tMLDinNdRBNPcYEDiWYysLcc6k3mjTMlbP9KyylvRpd4wFtwrT9rw==}
     engines: {node: ^20.17.0 || >=22.9.0}
 
-  mysql2@3.15.3:
-    resolution: {integrity: sha512-FBrGau0IXmuqg4haEZRBfHNWB5mUARw6hNwPDXXGg0XzVJ50mr/9hb267lvpVMnhZ1FON3qNd4Xfcez1rbFwSg==}
+  mysql2@3.24.2:
+    resolution: {integrity: sha512-l9kXeKGwd6VCbSjmpO/bLWb+YCYpbvE4whte8ec6InXebvCNyEEydyRCnRU+TSHNqRLJ8B+Tk1uWb+vMCJgJzA==}
     engines: {node: '>= 8.0'}
+    peerDependencies:
+      '@types/node': '>= 8'
 
   named-placeholders@1.1.6:
     resolution: {integrity: sha512-Tz09sEL2EEuv5fFowm419c1+a/jSMiBjI9gHxVLrVdbUkkNUUfjsVYs9pVZu5oCon/kmRh9TfLEObFtkVxmY0w==}
@@ -6410,9 +6405,6 @@ packages:
     resolution: {integrity: sha512-1gnZf7DFcoIcajTjTwjwuDjzuz4PPcY2StKPlsGAQ1+YH20IRVrBaXSWmdjowTJ6u8Rc01PoYOGHXfP1mYcZNQ==}
     engines: {node: '>= 18'}
 
-  seq-queue@0.0.5:
-    resolution: {integrity: sha512-hr3Wtp/GZIc/6DAGPDcV4/9WoZhjrkXsi5B/07QgX8tsdc6ilr7BFM6PM6rbdAX1kFSDYeZGLipIZZKyQP0O5Q==}
-
   serialize-error@13.0.1:
     resolution: {integrity: sha512-bBZaRwLH9PN5HbLCjPId4dP5bNGEtumcErgOX952IsvOhVPrm3/AeK1y0UHA/QaPG701eg0yEnOKsCOC6X/kaA==}
     engines: {node: '>=20'}
@@ -6526,9 +6518,9 @@ packages:
     resolution: {integrity: sha512-UcjcJOWknrNkF6PLX83qcHM6KHgVKNkV62Y8a5uYDVv9ydGQVwAHMKqHdJje1VTWpljG0WYpCDhrCdAOYH4TWg==}
     engines: {node: '>= 10.x'}
 
-  sqlstring@2.3.3:
-    resolution: {integrity: sha512-qC9iz2FlN7DQl3+wjwn3802RTyjCx7sDvfQEXchwa6CWOx07/WVfh91gBmQ9fahw8snwGEWU3xGzOt4tFyHLxg==}
-    engines: {node: '>= 0.6'}
+  sql-escaper@1.5.1:
+    resolution: {integrity: sha512-4toX5E1fQbBrpfXidaHnF0669nkAdETeIPTs2SUjxxD7RRIs9ICG4gtpmfc68JCEKehsdwLFqBu9VlQqZ1P1gg==}
+    engines: {bun: '>=1.0.0', deno: '>=2.0.0', node: '>=12.0.0'}
 
   ssh-remote-port-forward@1.0.4:
     resolution: {integrity: sha512-x0LV1eVDwjf1gmG7TTnfqIzf+3VPRz7vrNIjX6oYLbeCrf/PeVY6hkT68Mg+q02qXxQhrLjB0jfgvhevoCRmLQ==}
@@ -8863,11 +8855,11 @@ snapshots:
 
   '@prisma/client-runtime-utils@7.8.0': {}
 
-  '@prisma/client@7.8.0(prisma@7.8.0(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3))(typescript@6.0.3)':
+  '@prisma/client@7.8.0(prisma@7.8.0(@types/node@26.1.1)(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3))(typescript@6.0.3)':
     dependencies:
       '@prisma/client-runtime-utils': 7.8.0
     optionalDependencies:
-      prisma: 7.8.0(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3)
+      prisma: 7.8.0(@types/node@26.1.1)(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3)
       typescript: 6.0.3
 
   '@prisma/config@7.8.0(magicast@0.5.2)':
@@ -11036,8 +11028,6 @@ snapshots:
 
   defu@6.1.7: {}
 
-  denque@2.1.0: {}
-
   depd@2.0.0: {}
 
   destr@2.0.5: {}
@@ -11942,10 +11932,6 @@ snapshots:
 
   human-signals@8.0.1: {}
 
-  iconv-lite@0.7.2:
-    dependencies:
-      safer-buffer: 2.1.2
-
   iconv-lite@0.7.3:
     dependencies:
       safer-buffer: 2.1.2
@@ -12580,17 +12566,16 @@ snapshots:
 
   mute-stream@3.0.0: {}
 
-  mysql2@3.15.3:
+  mysql2@3.24.2(@types/node@26.1.1):
     dependencies:
+      '@types/node': 26.1.1
       aws-ssl-profiles: 1.1.2
-      denque: 2.1.0
       generate-function: 2.3.1
-      iconv-lite: 0.7.2
+      iconv-lite: 0.7.3
       long: 5.3.2
       lru.min: 1.1.4
       named-placeholders: 1.1.6
-      seq-queue: 0.0.5
-      sqlstring: 2.3.3
+      sql-escaper: 1.5.1
 
   named-placeholders@1.1.6:
     dependencies:
@@ -13051,17 +13036,18 @@ snapshots:
     dependencies:
       parse-ms: 4.0.0
 
-  prisma@7.8.0(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3):
+  prisma@7.8.0(@types/node@26.1.1)(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(magicast@0.5.2)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)(typescript@6.0.3):
     dependencies:
       '@prisma/config': 7.8.0(magicast@0.5.2)
       '@prisma/dev': 0.24.3(typescript@6.0.3)
       '@prisma/engines': 7.8.0
       '@prisma/studio-core': 0.27.3(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(react-dom@19.2.7(react@19.2.7))(react@19.2.7)
-      mysql2: 3.15.3
+      mysql2: 3.24.2(@types/node@26.1.1)
       postgres: 3.4.7
     optionalDependencies:
       typescript: 6.0.3
     transitivePeerDependencies:
+      - '@types/node'
       - '@types/react'
       - '@types/react-dom'
       - magicast
@@ -13502,8 +13488,6 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  seq-queue@0.0.5: {}
-
   serialize-error@13.0.1:
     dependencies:
       non-error: 0.1.0
@@ -13686,7 +13670,7 @@ snapshots:
 
   split2@4.2.0: {}
 
-  sqlstring@2.3.3: {}
+  sql-escaper@1.5.1: {}
 
   ssh-remote-port-forward@1.0.4:
     dependencies:
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index e25a0b26e..c90da0443 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -11,6 +11,11 @@ overrides:
   # The advisory covers 4.x only; the bound keeps a hypothetical 3.x consumer
   # off a major it never asked for.
   "js-yaml@>=4.0.0 <4.3.1": "^4.3.1"
+  # GHSA-3f6p-5ww8-9rcr: auth-plugin downgrade leaking plaintext credentials.
+  # Reached only through prisma's MySQL driver, which this app never opens;
+  # pinned so the audit reads clean, and mirrored for /opt/prisma-cli in the
+  # Dockerfile.
+  "mysql2@<3.22.0": "^3.22.0"
   # The scanner suggests 10.x (latest), but the ReDoS fix is backported: only
   # <3.1.4 is vulnerable, so the 3.x line stays where its consumers expect it.
   "minimatch@<3.1.4": "^3.1.4"
diff --git a/public/sw.js b/public/sw.js
index 3c6085690..9f03d8d64 100644
--- a/public/sw.js
+++ b/public/sw.js
@@ -36,7 +36,7 @@ try {
 // v1.4.38.4 → v1.4.42. Do not hand-edit; bump `package.json` and rebuild.
 const CACHE_VERSION =
   (typeof self !== "undefined" && self.__APP_VERSION__) ||
-  /* @sw-version-fallback */ "v1.38.0";
+  /* @sw-version-fallback */ "v1.38.1";
 const STATIC_CACHE = `healthlog-static-${CACHE_VERSION}`;
 const PAGE_CACHE = `healthlog-pages-${CACHE_VERSION}`;
 // v1.18.6 — read-only data cache for a curated allowlist of safe GET `/api/*`
diff --git a/src/__tests__/integration-callback-url-guard.test.ts b/src/__tests__/integration-callback-url-guard.test.ts
new file mode 100644
index 000000000..4ab934aa1
--- /dev/null
+++ b/src/__tests__/integration-callback-url-guard.test.ts
@@ -0,0 +1,56 @@
+/**
+ * Structural guard: no client module on the Settings → Integrations surface
+ * may read `process.env.NEXT_PUBLIC_APP_URL`.
+ *
+ * Why this is a tripwire and not a behavioural test. Next.js inlines every
+ * `NEXT_PUBLIC_*` reference in a `"use client"` module at BUILD time. The
+ * published image is built without `NEXT_PUBLIC_APP_URL` (the Dockerfile
+ * passes only the version / build-sha / built-at args, and `.env` files are
+ * not in the build context), so any such read compiles to `undefined` for
+ * every self-hoster, no matter what their runtime env says. A unit test with
+ * the variable set in `process.env` cannot see that: under Vitest the read is
+ * live, so the code passes while the shipped bundle is inert. v1.38.0's
+ * callback-origin notice shipped exactly that way.
+ *
+ * The callback URL therefore comes from the server (`getIntegrationCallbackUrls`
+ * in `src/lib/integrations/callback-urls.ts`) and travels down as a prop. This
+ * guard fails the moment a client file on the surface reaches for the env var
+ * again.
+ */
+import { describe, expect, it } from "vitest";
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+import { walkSourceFiles } from "./helpers/source-files";
+
+const SURFACE = join(process.cwd(), "src/components/settings/integrations");
+
+const CLIENT_DIRECTIVE = /^\s*["']use client["']\s*;?/m;
+const APP_URL_READ = /process\.env\.NEXT_PUBLIC_APP_URL/;
+
+function surfaceFiles(): string[] {
+  return walkSourceFiles(SURFACE, { floor: 15 })
+    .filter((p) => !p.includes("__tests__"))
+    .filter((p) => !p.endsWith(".test.ts") && !p.endsWith(".test.tsx"));
+}
+
+describe("Settings → Integrations client modules never read NEXT_PUBLIC_APP_URL", () => {
+  it('every "use client" file on the surface is free of the env read', () => {
+    const files = surfaceFiles();
+    const clientFiles = files.filter((rel) =>
+      CLIENT_DIRECTIVE.test(readFileSync(join(SURFACE, rel), "utf8")),
+    );
+    // The walk must have found the surface, and the surface must still be
+    // client-rendered — an empty set would pass on a tree the guard never read.
+    expect(files.length).toBeGreaterThanOrEqual(15);
+    expect(clientFiles.length).toBeGreaterThanOrEqual(10);
+
+    const offenders = clientFiles.filter((rel) =>
+      APP_URL_READ.test(readFileSync(join(SURFACE, rel), "utf8")),
+    );
+    expect(
+      offenders,
+      `NEXT_PUBLIC_APP_URL is inlined at build time in client bundles and is empty in the published image; pass the server-derived callback URL as a prop instead: ${offenders.join(", ")}`,
+    ).toEqual([]);
+  });
+});
diff --git a/src/app/settings/[section]/page.tsx b/src/app/settings/[section]/page.tsx
index 572123d39..f5c4a559a 100644
--- a/src/app/settings/[section]/page.tsx
+++ b/src/app/settings/[section]/page.tsx
@@ -29,6 +29,7 @@ import {
 } from "@/components/settings/section-slugs";
 import { SettingsShell } from "@/components/settings/settings-shell";
 import { RecordSettingsSectionGate } from "@/components/settings/record-settings-section-gate";
+import { getIntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 
 /**
  * Dynamic settings section route. Each of the `SETTINGS_SECTION_SLUGS`
@@ -46,6 +47,17 @@ export function generateStaticParams() {
   return SETTINGS_SECTION_SLUGS.map((section) => ({ section }));
 }
 
+/**
+ * Integrations is the one section that needs a server-resolved value: the
+ * OAuth callback URL each provider registers. It is read from the runtime env
+ * here, per request, and handed to the client section as a prop, because a
+ * `NEXT_PUBLIC_*` read inside a client module is inlined at build time and the
+ * published image is built without it.
+ */
+function IntegrationsSectionWithCallbackUrls() {
+  return <IntegrationsSection callbackUrls={getIntegrationCallbackUrls()} />;
+}
+
 const SECTION_COMPONENTS: Record<
   SettingsSectionSlug,
   () => JSX.Element | null
@@ -57,7 +69,7 @@ const SECTION_COMPONENTS: Record<
   about: AboutSection,
   ai: AiSection,
   coach: CoachSection,
-  integrations: IntegrationsSection,
+  integrations: IntegrationsSectionWithCallbackUrls,
   sources: SourcesSection,
   notifications: NotificationsSection,
   layout: LayoutSection,
diff --git a/src/components/settings/__tests__/integrations-section.test.tsx b/src/components/settings/__tests__/integrations-section.test.tsx
index 929dfb29e..cdf1792b0 100644
--- a/src/components/settings/__tests__/integrations-section.test.tsx
+++ b/src/components/settings/__tests__/integrations-section.test.tsx
@@ -75,10 +75,20 @@ vi.mock("@tanstack/react-query", () => ({
 import { I18nProvider } from "@/lib/i18n/context";
 import { IntegrationsSection } from "../integrations-section";
 
+const CALLBACK_URLS = {
+  withings: "https://app.example/api/withings/callback",
+  whoop: "https://app.example/api/whoop/callback",
+  fitbit: "https://app.example/api/fitbit/callback",
+  "google-health": "https://app.example/api/google-health/callback",
+  polar: "https://app.example/api/polar/callback",
+  oura: "https://app.example/api/oura/callback",
+  strava: "https://app.example/api/strava/callback",
+};
+
 function render() {
   return renderToStaticMarkup(
     <I18nProvider initialLocale="en">
-      <IntegrationsSection />
+      <IntegrationsSection callbackUrls={CALLBACK_URLS} />
     </I18nProvider>,
   );
 }
diff --git a/src/components/settings/__tests__/sections.test.tsx b/src/components/settings/__tests__/sections.test.tsx
index 782bfe7ed..0abf949a0 100644
--- a/src/components/settings/__tests__/sections.test.tsx
+++ b/src/components/settings/__tests__/sections.test.tsx
@@ -104,6 +104,16 @@ import { NotificationsSection } from "../notifications-section";
 // slug like every other settings section.
 import { ThresholdsSection } from "../thresholds-section";
 
+const CALLBACK_URLS = {
+  withings: "https://app.example/api/withings/callback",
+  whoop: "https://app.example/api/whoop/callback",
+  fitbit: "https://app.example/api/fitbit/callback",
+  "google-health": "https://app.example/api/google-health/callback",
+  polar: "https://app.example/api/polar/callback",
+  oura: "https://app.example/api/oura/callback",
+  strava: "https://app.example/api/strava/callback",
+};
+
 function render(node: React.ReactElement, locale: "en" | "de" = "en") {
   return renderToStaticMarkup(
     <I18nProvider initialLocale={locale}>{node}</I18nProvider>,
@@ -184,7 +194,10 @@ describe("settings sections — SSR smoke", () => {
   });
 
   it("<IntegrationsSection> renders Withings card + the delivery-channels group", () => {
-    const html = renderFramed("integrations", <IntegrationsSection />);
+    const html = renderFramed(
+      "integrations",
+      <IntegrationsSection callbackUrls={CALLBACK_URLS} />,
+    );
     expect(html).toContain("Integrations");
     expect(html).toContain("Withings");
     // v1.25.7 — delivery channels moved here from Notifications: the
diff --git a/src/components/settings/integrations-section.tsx b/src/components/settings/integrations-section.tsx
index 1408d4698..8f1247cb3 100644
--- a/src/components/settings/integrations-section.tsx
+++ b/src/components/settings/integrations-section.tsx
@@ -32,6 +32,7 @@ import Link from "next/link";
 import { Link2, Send } from "lucide-react";
 
 import { useTranslations } from "@/lib/i18n/context";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 import { ConnectionsPanel } from "@/components/settings/integrations/connections-panel";
 import { SectionHeading } from "@/components/ui/section-heading";
 import { NotificationChannelsPanel } from "@/components/settings/integrations/notification-channels-panel";
@@ -43,7 +44,12 @@ export {
   oauthReasonKey,
 } from "@/components/settings/integrations/connections-panel";
 
-export function IntegrationsSection() {
+export function IntegrationsSection({
+  callbackUrls,
+}: {
+  /** Server-resolved per-provider OAuth callback URLs; see `ConnectionsPanel`. */
+  callbackUrls: IntegrationCallbackUrls;
+}) {
   const { t } = useTranslations();
 
   // v1.18.6 (W9) — the visible page heading + subtitle come from the shared
@@ -59,7 +65,7 @@ export function IntegrationsSection() {
           icon={Link2}
           title={t("settings.sections.integrations.connectionsHeading")}
         />
-        <ConnectionsPanel />
+        <ConnectionsPanel callbackUrls={callbackUrls} />
 
         {/* 2026-07-17 UX/IA audit M7 — the opt-in nutrients sync inventory
             (moved from Settings → Sources, where "source priority" only
diff --git a/src/components/settings/integrations/__tests__/callback-mismatch-notice.test.tsx b/src/components/settings/integrations/__tests__/callback-mismatch-notice.test.tsx
new file mode 100644
index 000000000..38f9d2271
--- /dev/null
+++ b/src/components/settings/integrations/__tests__/callback-mismatch-notice.test.tsx
@@ -0,0 +1,75 @@
+/**
+ * `<CallbackMismatchNotice>` renders from the callback URL it is HANDED, not
+ * from anything it reads itself. The origin the browser is on comes through
+ * `useSyncExternalStore`, whose server snapshot is deliberately `null` (the
+ * server cannot know the browser origin, and a notice that flips at hydration
+ * would flash). A static render therefore never shows it; to exercise the
+ * client path here the hook is replaced with its client snapshot and a bare
+ * `window.location.origin` is provided.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { renderToStaticMarkup } from "react-dom/server";
+
+vi.mock("react", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("react")>();
+  return {
+    ...actual,
+    useSyncExternalStore: <T,>(
+      _subscribe: (onChange: () => void) => () => void,
+      getSnapshot: () => T,
+    ): T => getSnapshot(),
+  };
+});
+
+import { I18nProvider } from "@/lib/i18n/context";
+import { CallbackMismatchNotice } from "../setup-guide-link";
+
+const BROWSER_ORIGIN = "https://health.example";
+
+function render(callbackUrl: string | null) {
+  return renderToStaticMarkup(
+    <I18nProvider initialLocale="en">
+      <CallbackMismatchNotice provider="WHOOP" callbackUrl={callbackUrl} />
+    </I18nProvider>,
+  );
+}
+
+describe("<CallbackMismatchNotice>", () => {
+  const priorWindow = (globalThis as { window?: unknown }).window;
+
+  beforeEach(() => {
+    (globalThis as { window?: unknown }).window = {
+      location: { origin: BROWSER_ORIGIN },
+    };
+  });
+
+  afterEach(() => {
+    if (priorWindow === undefined) {
+      delete (globalThis as { window?: unknown }).window;
+    } else {
+      (globalThis as { window?: unknown }).window = priorWindow;
+    }
+  });
+
+  it("renders the warning when the configured callback origin differs from the browser origin", () => {
+    const html = render("https://edge.example/api/whoop/callback");
+    expect(html).toContain("WHOOP");
+    expect(html).toContain("https://edge.example");
+    expect(html).toContain(BROWSER_ORIGIN);
+    expect(html).toContain("differs from this app address");
+  });
+
+  it("renders nothing when the callback origin matches the browser origin", () => {
+    expect(render(`${BROWSER_ORIGIN}/api/whoop/callback`)).toBe("");
+  });
+
+  it("renders nothing when the server could not produce a callback URL", () => {
+    expect(render(null)).toBe("");
+  });
+
+  it("renders nothing for a callback URL that is not absolute", () => {
+    // The pre-fix client bundle produced exactly this shape and the notice
+    // stayed silent; it still must, rather than throwing out of the card.
+    expect(render("/api/whoop/callback")).toBe("");
+  });
+});
diff --git a/src/components/settings/integrations/__tests__/connections-panel-coverage.test.tsx b/src/components/settings/integrations/__tests__/connections-panel-coverage.test.tsx
index a8cdb2e1f..c06fa4d22 100644
--- a/src/components/settings/integrations/__tests__/connections-panel-coverage.test.tsx
+++ b/src/components/settings/integrations/__tests__/connections-panel-coverage.test.tsx
@@ -84,10 +84,20 @@ function fullEnvelope() {
   };
 }
 
+const CALLBACK_URLS = {
+  withings: "https://app.example/api/withings/callback",
+  whoop: "https://app.example/api/whoop/callback",
+  fitbit: "https://app.example/api/fitbit/callback",
+  "google-health": "https://app.example/api/google-health/callback",
+  polar: "https://app.example/api/polar/callback",
+  oura: "https://app.example/api/oura/callback",
+  strava: "https://app.example/api/strava/callback",
+};
+
 function render() {
   return renderToStaticMarkup(
     <I18nProvider initialLocale="en">
-      <ConnectionsPanel />
+      <ConnectionsPanel callbackUrls={CALLBACK_URLS} />
     </I18nProvider>,
   );
 }
diff --git a/src/components/settings/integrations/__tests__/oauth-provider-card.test.tsx b/src/components/settings/integrations/__tests__/oauth-provider-card.test.tsx
index b4fc2d3ef..b47765b63 100644
--- a/src/components/settings/integrations/__tests__/oauth-provider-card.test.tsx
+++ b/src/components/settings/integrations/__tests__/oauth-provider-card.test.tsx
@@ -41,6 +41,7 @@ function render({
         dataHref="/insights/sleep"
         credentials={credentials}
         viewModel={viewModel}
+        callbackUrl="https://app.example/api/polar/callback"
       />
     </I18nProvider>,
   );
@@ -162,7 +163,6 @@ describe("OAuthProviderCard — per-user BYO credentials form (v1.17.1)", () =>
 
 describe("OAuthProviderCard — redirect-URI mini-guide (v1.29.x, UX audit H2)", () => {
   it("shows the callback URL guide before the user has BYO credentials", () => {
-    process.env.NEXT_PUBLIC_APP_URL = "https://app.example";
     const html = render({
       credentials: true,
       viewModel: {
diff --git a/src/components/settings/integrations/__tests__/whoop-card.test.tsx b/src/components/settings/integrations/__tests__/whoop-card.test.tsx
index 3faae333a..6d5bc5388 100644
--- a/src/components/settings/integrations/__tests__/whoop-card.test.tsx
+++ b/src/components/settings/integrations/__tests__/whoop-card.test.tsx
@@ -15,11 +15,15 @@ import { I18nProvider } from "@/lib/i18n/context";
 import { WhoopCard } from "../whoop-card";
 import type { IntegrationStatusViewModel } from "../shared";
 
-function render(viewModel?: Partial<IntegrationStatusViewModel>) {
+function render(
+  viewModel?: Partial<IntegrationStatusViewModel>,
+  callbackUrl: string | null = "https://app.example/api/whoop/callback",
+) {
   return renderToStaticMarkup(
     <I18nProvider initialLocale="en">
       <WhoopCard
         viewModel={viewModel as IntegrationStatusViewModel | undefined}
+        callbackUrl={callbackUrl}
       />
     </I18nProvider>,
   );
@@ -27,13 +31,19 @@ function render(viewModel?: Partial<IntegrationStatusViewModel>) {
 
 describe("<WhoopCard> redirect-URI mini-guide", () => {
   it("shows the callback URL guide before credentials are configured", () => {
-    process.env.NEXT_PUBLIC_APP_URL = "https://app.example";
     const html = render({ connected: false, configured: false });
     expect(html).toContain('data-testid="whoop-redirect-guide"');
     expect(html).toContain('data-testid="whoop-redirect-uri"');
     expect(html).toContain("https://app.example/api/whoop/callback");
   });
 
+  it("falls back to the fixed path when the server has no redirect URI", () => {
+    const html = render({ connected: false, configured: false }, null);
+    expect(html).toContain('data-testid="whoop-redirect-uri"');
+    expect(html).toContain("/api/whoop/callback");
+    expect(html).not.toContain("undefined/api/whoop/callback");
+  });
+
   it("hides the guide once credentials are configured", () => {
     const html = render({ connected: false, configured: true });
     expect(html).not.toContain('data-testid="whoop-redirect-guide"');
diff --git a/src/components/settings/integrations/connections-panel.tsx b/src/components/settings/integrations/connections-panel.tsx
index c2e5c01c1..89dbfeb89 100644
--- a/src/components/settings/integrations/connections-panel.tsx
+++ b/src/components/settings/integrations/connections-panel.tsx
@@ -35,6 +35,7 @@ import {
 import { WhoopCard } from "@/components/settings/integrations/whoop-card";
 import { WithingsCard } from "@/components/settings/integrations/withings-card";
 import { useAuth } from "@/hooks/use-auth";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 import { useTranslations } from "@/lib/i18n/context";
 import { queryKeys } from "@/lib/query-keys";
 
@@ -209,7 +210,17 @@ const CARD_BACKED_INTEGRATIONS: ReadonlySet<IntegrationKey> = new Set([
   "nightscout",
 ]);
 
-export function ConnectionsPanel() {
+export function ConnectionsPanel({
+  callbackUrls,
+}: {
+  /**
+   * The per-provider OAuth callback URLs, resolved on the server per request
+   * (`getIntegrationCallbackUrls`) and threaded down from the route. A client
+   * module cannot derive them: `NEXT_PUBLIC_APP_URL` is inlined at build
+   * time and absent from the published image.
+   */
+  callbackUrls: IntegrationCallbackUrls;
+}) {
   const { t } = useTranslations();
   const { isAuthenticated } = useAuth();
   const router = useRouter();
@@ -328,28 +339,46 @@ export function ConnectionsPanel() {
       {/* Per-provider anchors so deep-links (onboarding "more sources" chips,
           `/settings/integrations#oura`) scroll straight to the right card. */}
       <div id="withings" className="scroll-mt-28">
-        <WithingsCard viewModel={withingsViewModel} />
+        <WithingsCard
+          viewModel={withingsViewModel}
+          callbackUrl={callbackUrls.withings}
+        />
       </div>
       <div id="whoop" className="scroll-mt-28">
-        <WhoopCard viewModel={whoopViewModel} />
+        <WhoopCard
+          viewModel={whoopViewModel}
+          callbackUrl={callbackUrls.whoop}
+        />
       </div>
       <div id="fitbit" className="scroll-mt-28">
-        <FitbitCard viewModel={fitbitViewModel} />
+        <FitbitCard
+          viewModel={fitbitViewModel}
+          callbackUrl={callbackUrls.fitbit}
+        />
       </div>
       <div id="google-health" className="scroll-mt-28">
-        <GoogleHealthCard viewModel={googleHealthViewModel} />
+        <GoogleHealthCard
+          viewModel={googleHealthViewModel}
+          callbackUrl={callbackUrls["google-health"]}
+        />
       </div>
       <div id="apple-health" className="scroll-mt-28">
         <AppleHealthCard enabled={isAuthenticated} />
       </div>
       <div id="polar" className="scroll-mt-28">
-        <PolarCard viewModel={polarViewModel} />
+        <PolarCard
+          viewModel={polarViewModel}
+          callbackUrl={callbackUrls.polar}
+        />
       </div>
       <div id="oura" className="scroll-mt-28">
-        <OuraCard viewModel={ouraViewModel} />
+        <OuraCard viewModel={ouraViewModel} callbackUrl={callbackUrls.oura} />
       </div>
       <div id="strava" className="scroll-mt-28">
-        <StravaCard viewModel={stravaViewModel} />
+        <StravaCard
+          viewModel={stravaViewModel}
+          callbackUrl={callbackUrls.strava}
+        />
       </div>
       <div id="nightscout" className="scroll-mt-28">
         <NightscoutCard viewModel={nightscoutViewModel} />
diff --git a/src/components/settings/integrations/fitbit-card.tsx b/src/components/settings/integrations/fitbit-card.tsx
index 98e7c4056..2d16a8f7a 100644
--- a/src/components/settings/integrations/fitbit-card.tsx
+++ b/src/components/settings/integrations/fitbit-card.tsx
@@ -68,13 +68,16 @@ import {
   CallbackMismatchNotice,
   IntegrationCardDescription,
   IntegrationRedirectGuide,
-  integrationCallbackUrl,
 } from "./setup-guide-link";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 
 export function FitbitCard({
   viewModel,
+  callbackUrl,
 }: {
   viewModel: IntegrationStatusViewModel | undefined;
+  /** Server-resolved OAuth callback URL; see `getIntegrationCallbackUrls`. */
+  callbackUrl: IntegrationCallbackUrls["fitbit"];
 }) {
   const { t } = useTranslations();
   const describeSyncOutcome = useSyncOutcomeMessage();
@@ -314,6 +317,7 @@ export function FitbitCard({
             <IntegrationRedirectGuide
               provider="fitbit"
               providerLabel={t("settings.fitbit")}
+              callbackUrl={callbackUrl}
             />
           )}
           <form onSubmit={handleSaveCredentials} className="space-y-3">
@@ -525,7 +529,7 @@ export function FitbitCard({
       </div>
       <CallbackMismatchNotice
         provider={t("settings.fitbit")}
-        callbackUrl={integrationCallbackUrl("fitbit")}
+        callbackUrl={callbackUrl}
       />
     </SettingsCard>
   );
diff --git a/src/components/settings/integrations/google-health-card.tsx b/src/components/settings/integrations/google-health-card.tsx
index 99b127409..86ea06dc3 100644
--- a/src/components/settings/integrations/google-health-card.tsx
+++ b/src/components/settings/integrations/google-health-card.tsx
@@ -83,13 +83,16 @@ import {
 import {
   CallbackMismatchNotice,
   IntegrationCardDescription,
-  integrationCallbackUrl,
 } from "./setup-guide-link";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 
 export function GoogleHealthCard({
   viewModel,
+  callbackUrl,
 }: {
   viewModel: IntegrationStatusViewModel | undefined;
+  /** Server-resolved OAuth callback URL; see `getIntegrationCallbackUrls`. */
+  callbackUrl: IntegrationCallbackUrls["google-health"];
 }) {
   const { t } = useTranslations();
   const describeSyncOutcome = useSyncOutcomeMessage();
@@ -764,7 +767,7 @@ export function GoogleHealthCard({
       </div>
       <CallbackMismatchNotice
         provider={t("settings.googleHealth")}
-        callbackUrl={integrationCallbackUrl("google-health")}
+        callbackUrl={callbackUrl}
       />
     </SettingsCard>
   );
diff --git a/src/components/settings/integrations/oauth-provider-card.tsx b/src/components/settings/integrations/oauth-provider-card.tsx
index 147fcc79a..4b8d2e5b7 100644
--- a/src/components/settings/integrations/oauth-provider-card.tsx
+++ b/src/components/settings/integrations/oauth-provider-card.tsx
@@ -69,8 +69,8 @@ import {
   IntegrationCardDescription,
   IntegrationRedirectGuide,
   type IntegrationDocsProvider,
-  integrationCallbackUrl,
 } from "./setup-guide-link";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 
 export interface OAuthProviderStatus {
   connected: boolean;
@@ -123,6 +123,8 @@ export interface OAuthProviderCardProps {
    * exist.
    */
   viewModel?: OAuthProviderStatus;
+  /** Server-resolved OAuth callback URL; see `getIntegrationCallbackUrls`. */
+  callbackUrl: IntegrationCallbackUrls[OAuthProviderCardProps["provider"]];
 }
 
 export function OAuthProviderCard({
@@ -133,6 +135,7 @@ export function OAuthProviderCard({
   dataHref,
   credentials = false,
   viewModel,
+  callbackUrl,
 }: OAuthProviderCardProps) {
   const { t } = useTranslations();
   const describeSyncOutcome = useSyncOutcomeMessage();
@@ -341,6 +344,7 @@ export function OAuthProviderCard({
               <IntegrationRedirectGuide
                 provider={provider}
                 providerLabel={t(i18nPrefix)}
+                callbackUrl={callbackUrl}
               />
             )}
             <form onSubmit={handleSaveCredentials} className="space-y-3">
@@ -526,7 +530,7 @@ export function OAuthProviderCard({
       </div>
       <CallbackMismatchNotice
         provider={t(i18nPrefix)}
-        callbackUrl={integrationCallbackUrl(provider)}
+        callbackUrl={callbackUrl}
       />
     </SettingsCard>
   );
diff --git a/src/components/settings/integrations/oura-card.tsx b/src/components/settings/integrations/oura-card.tsx
index 068726982..cb669d917 100644
--- a/src/components/settings/integrations/oura-card.tsx
+++ b/src/components/settings/integrations/oura-card.tsx
@@ -10,9 +10,16 @@ import {
   OAuthProviderCard,
   type OAuthProviderStatus,
 } from "@/components/settings/integrations/oauth-provider-card";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 import { queryKeys } from "@/lib/query-keys";
 
-export function OuraCard({ viewModel }: { viewModel?: OAuthProviderStatus }) {
+export function OuraCard({
+  viewModel,
+  callbackUrl,
+}: {
+  viewModel?: OAuthProviderStatus;
+  callbackUrl: IntegrationCallbackUrls["oura"];
+}) {
   return (
     <OAuthProviderCard
       provider="oura"
@@ -22,6 +29,7 @@ export function OuraCard({ viewModel }: { viewModel?: OAuthProviderStatus }) {
       dataHref="/insights/sleep"
       credentials
       viewModel={viewModel}
+      callbackUrl={callbackUrl}
     />
   );
 }
diff --git a/src/components/settings/integrations/polar-card.tsx b/src/components/settings/integrations/polar-card.tsx
index 592e04836..4900e449e 100644
--- a/src/components/settings/integrations/polar-card.tsx
+++ b/src/components/settings/integrations/polar-card.tsx
@@ -10,9 +10,16 @@ import {
   OAuthProviderCard,
   type OAuthProviderStatus,
 } from "@/components/settings/integrations/oauth-provider-card";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 import { queryKeys } from "@/lib/query-keys";
 
-export function PolarCard({ viewModel }: { viewModel?: OAuthProviderStatus }) {
+export function PolarCard({
+  viewModel,
+  callbackUrl,
+}: {
+  viewModel?: OAuthProviderStatus;
+  callbackUrl: IntegrationCallbackUrls["polar"];
+}) {
   return (
     <OAuthProviderCard
       provider="polar"
@@ -22,6 +29,7 @@ export function PolarCard({ viewModel }: { viewModel?: OAuthProviderStatus }) {
       dataHref="/insights/sleep"
       credentials
       viewModel={viewModel}
+      callbackUrl={callbackUrl}
     />
   );
 }
diff --git a/src/components/settings/integrations/setup-guide-link.tsx b/src/components/settings/integrations/setup-guide-link.tsx
index 23889a30a..dab6e8cbb 100644
--- a/src/components/settings/integrations/setup-guide-link.tsx
+++ b/src/components/settings/integrations/setup-guide-link.tsx
@@ -40,25 +40,21 @@ export function integrationDocsHref(provider: IntegrationDocsProvider): string {
 }
 
 /**
- * The OAuth callback path every BYO-key provider registers against. Every
- * provider's `getRedirectUri()` (`src/lib/{provider}/client.ts`) derives the
- * same shape from `NEXT_PUBLIC_APP_URL` unless an operator overrides it with
- * an explicit `*_REDIRECT_URI` env var — the common case this card targets.
+ * Shows a compact warning when the callback origin differs from the app.
+ *
+ * `callbackUrl` is the value the server registers as `redirect_uri`, resolved
+ * per request by `getIntegrationCallbackUrls()` and passed down as a prop. It
+ * must not be derived here: a `NEXT_PUBLIC_*` read in a client module is
+ * inlined at build time, and the published image is built without it.
+ * `null` means the provider cannot build a redirect URI from the current env,
+ * so there is nothing to compare.
  */
-export function integrationCallbackUrl(
-  provider: IntegrationDocsProvider,
-): string {
-  const base = process.env.NEXT_PUBLIC_APP_URL ?? "";
-  return `${base}/api/${provider}/callback`;
-}
-
-/** Shows a compact warning when the callback origin differs from the app. */
 export function CallbackMismatchNotice({
   provider,
   callbackUrl,
 }: {
   provider: string;
-  callbackUrl: string;
+  callbackUrl: string | null;
 }) {
   // Get the current origin of the app
   const { t } = useTranslations();
@@ -69,6 +65,7 @@ export function CallbackMismatchNotice({
   );
   // Get the origin of the callback URL
   const callbackOrigin = (() => {
+    if (!callbackUrl) return null;
     try {
       return new URL(callbackUrl).origin;
     } catch {
@@ -103,12 +100,19 @@ export function CallbackMismatchNotice({
 export function IntegrationRedirectGuide({
   provider,
   providerLabel,
+  callbackUrl,
 }: {
   provider: IntegrationDocsProvider;
   providerLabel: string;
+  /**
+   * The server-resolved callback URL (see `CallbackMismatchNotice`). When the
+   * provider cannot build one from the current env, show the fixed path so
+   * the step still names what the vendor form expects.
+   */
+  callbackUrl: string | null;
 }) {
   const { t } = useTranslations();
-  const callbackUrl = integrationCallbackUrl(provider);
+  const shownCallbackUrl = callbackUrl ?? `/api/${provider}/callback`;
   return (
     <div
       className="bg-muted/40 border-border/60 space-y-1.5 rounded-md border p-3 text-xs"
@@ -131,7 +135,7 @@ export function IntegrationRedirectGuide({
             className="bg-background text-foreground rounded px-1 py-0.5 font-mono break-all"
             data-testid={`${provider}-redirect-uri`}
           >
-            {callbackUrl}
+            {shownCallbackUrl}
           </code>
         </li>
         <li>{t("settings.integrationRedirectGuide.step3")}</li>
diff --git a/src/components/settings/integrations/strava-card.tsx b/src/components/settings/integrations/strava-card.tsx
index c2a501f50..534558e02 100644
--- a/src/components/settings/integrations/strava-card.tsx
+++ b/src/components/settings/integrations/strava-card.tsx
@@ -11,9 +11,16 @@ import {
   OAuthProviderCard,
   type OAuthProviderStatus,
 } from "@/components/settings/integrations/oauth-provider-card";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 import { queryKeys } from "@/lib/query-keys";
 
-export function StravaCard({ viewModel }: { viewModel?: OAuthProviderStatus }) {
+export function StravaCard({
+  viewModel,
+  callbackUrl,
+}: {
+  viewModel?: OAuthProviderStatus;
+  callbackUrl: IntegrationCallbackUrls["strava"];
+}) {
   return (
     <OAuthProviderCard
       provider="strava"
@@ -23,6 +30,7 @@ export function StravaCard({ viewModel }: { viewModel?: OAuthProviderStatus }) {
       dataHref="/insights/workouts"
       credentials
       viewModel={viewModel}
+      callbackUrl={callbackUrl}
     />
   );
 }
diff --git a/src/components/settings/integrations/whoop-card.tsx b/src/components/settings/integrations/whoop-card.tsx
index db02bd914..2b4fad121 100644
--- a/src/components/settings/integrations/whoop-card.tsx
+++ b/src/components/settings/integrations/whoop-card.tsx
@@ -59,13 +59,16 @@ import {
   CallbackMismatchNotice,
   IntegrationCardDescription,
   IntegrationRedirectGuide,
-  integrationCallbackUrl,
 } from "./setup-guide-link";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 
 export function WhoopCard({
   viewModel,
+  callbackUrl,
 }: {
   viewModel: IntegrationStatusViewModel | undefined;
+  /** Server-resolved OAuth callback URL; see `getIntegrationCallbackUrls`. */
+  callbackUrl: IntegrationCallbackUrls["whoop"];
 }) {
   const { t } = useTranslations();
   const describeSyncOutcome = useSyncOutcomeMessage();
@@ -296,6 +299,7 @@ export function WhoopCard({
             <IntegrationRedirectGuide
               provider="whoop"
               providerLabel={t("settings.whoop")}
+              callbackUrl={callbackUrl}
             />
           )}
           <form onSubmit={handleSaveCredentials} className="space-y-3">
@@ -507,7 +511,7 @@ export function WhoopCard({
       </div>
       <CallbackMismatchNotice
         provider={t("settings.whoop")}
-        callbackUrl={integrationCallbackUrl("whoop")}
+        callbackUrl={callbackUrl}
       />
     </SettingsCard>
   );
diff --git a/src/components/settings/integrations/withings-card.tsx b/src/components/settings/integrations/withings-card.tsx
index b85c8b03b..ec8d61ce5 100644
--- a/src/components/settings/integrations/withings-card.tsx
+++ b/src/components/settings/integrations/withings-card.tsx
@@ -58,13 +58,16 @@ import {
   CallbackMismatchNotice,
   IntegrationCardDescription,
   IntegrationRedirectGuide,
-  integrationCallbackUrl,
 } from "./setup-guide-link";
+import type { IntegrationCallbackUrls } from "@/lib/integrations/callback-urls";
 
 export function WithingsCard({
   viewModel,
+  callbackUrl,
 }: {
   viewModel: IntegrationStatusViewModel | undefined;
+  /** Server-resolved OAuth callback URL; see `getIntegrationCallbackUrls`. */
+  callbackUrl: IntegrationCallbackUrls["withings"];
 }) {
   const { t } = useTranslations();
   const describeSyncOutcome = useSyncOutcomeMessage();
@@ -335,6 +338,7 @@ export function WithingsCard({
             <IntegrationRedirectGuide
               provider="withings"
               providerLabel={t("settings.withings")}
+              callbackUrl={callbackUrl}
             />
           )}
           <form onSubmit={handleSaveCredentials} className="space-y-3">
@@ -556,7 +560,7 @@ export function WithingsCard({
       </div>
       <CallbackMismatchNotice
         provider={t("settings.withings")}
-        callbackUrl={integrationCallbackUrl("withings")}
+        callbackUrl={callbackUrl}
       />
     </SettingsCard>
   );
diff --git a/src/lib/fitbit/client.ts b/src/lib/fitbit/client.ts
index 29704735f..1015e15fa 100644
--- a/src/lib/fitbit/client.ts
+++ b/src/lib/fitbit/client.ts
@@ -75,7 +75,7 @@ export interface FitbitCredentials {
  *   - must land on the fixed `/api/fitbit/callback` path,
  *   - when derived from `NEXT_PUBLIC_APP_URL`, must stay same-origin with it.
  */
-function getRedirectUri(): string {
+export function getFitbitRedirectUri(): string {
   const explicit = process.env.FITBIT_REDIRECT_URI;
   const appUrl = process.env.NEXT_PUBLIC_APP_URL;
   const raw =
@@ -188,7 +188,7 @@ export function getAuthorizationUrl(
   const params = new URLSearchParams({
     response_type: "code",
     client_id: creds.clientId,
-    redirect_uri: getRedirectUri(),
+    redirect_uri: getFitbitRedirectUri(),
     scope: FITBIT_OAUTH_SCOPE,
     code_challenge: codeChallenge,
     code_challenge_method: "S256",
@@ -287,7 +287,7 @@ export async function exchangeCode(
       grant_type: "authorization_code",
       code,
       client_id: creds.clientId,
-      redirect_uri: getRedirectUri(),
+      redirect_uri: getFitbitRedirectUri(),
       code_verifier: codeVerifier,
     }),
     creds,
diff --git a/src/lib/google-health/client.ts b/src/lib/google-health/client.ts
index 659ccc75a..cb5a33b94 100644
--- a/src/lib/google-health/client.ts
+++ b/src/lib/google-health/client.ts
@@ -146,7 +146,7 @@ export interface GoogleHealthCredentials {
  *   - must land on the fixed `/api/google-health/callback` path,
  *   - when derived from `NEXT_PUBLIC_APP_URL`, must stay same-origin with it.
  */
-function getRedirectUri(): string {
+export function getGoogleHealthRedirectUri(): string {
   const explicit = process.env.GOOGLE_HEALTH_REDIRECT_URI;
   const appUrl = process.env.NEXT_PUBLIC_APP_URL;
   const raw =
@@ -276,7 +276,7 @@ export function getAuthorizationUrl(
   const params = new URLSearchParams({
     response_type: "code",
     client_id: creds.clientId,
-    redirect_uri: getRedirectUri(),
+    redirect_uri: getGoogleHealthRedirectUri(),
     scope: getGoogleHealthScopeString(),
     access_type: "offline",
     prompt: "consent",
@@ -371,7 +371,7 @@ export async function exchangeCode(
       grant_type: "authorization_code",
       code,
       client_id: creds.clientId,
-      redirect_uri: getRedirectUri(),
+      redirect_uri: getGoogleHealthRedirectUri(),
       code_verifier: codeVerifier,
     }),
     creds,
diff --git a/src/lib/integrations/__tests__/callback-urls.test.ts b/src/lib/integrations/__tests__/callback-urls.test.ts
new file mode 100644
index 000000000..27d25c2e3
--- /dev/null
+++ b/src/lib/integrations/__tests__/callback-urls.test.ts
@@ -0,0 +1,113 @@
+/**
+ * `getIntegrationCallbackUrls()` must hand the Settings → Integrations cards
+ * the exact `redirect_uri` each provider's client registers: the explicit
+ * `<PROVIDER>_REDIRECT_URI` when the operator set one, the
+ * `${NEXT_PUBLIC_APP_URL}/api/<provider>/callback` form otherwise. The map
+ * goes through the provider functions themselves rather than restating the
+ * rule, so this test pins that the wiring reaches every provider and that a
+ * provider whose validation throws surfaces as `null` instead of taking the
+ * page down.
+ */
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+
+import {
+  INTEGRATION_CALLBACK_PROVIDERS,
+  getIntegrationCallbackUrls,
+} from "../callback-urls";
+
+const OVERRIDE_VARS: Record<
+  (typeof INTEGRATION_CALLBACK_PROVIDERS)[number],
+  string
+> = {
+  withings: "WITHINGS_REDIRECT_URI",
+  whoop: "WHOOP_REDIRECT_URI",
+  fitbit: "FITBIT_REDIRECT_URI",
+  "google-health": "GOOGLE_HEALTH_REDIRECT_URI",
+  polar: "POLAR_REDIRECT_URI",
+  oura: "OURA_REDIRECT_URI",
+  strava: "STRAVA_REDIRECT_URI",
+};
+
+const TOUCHED = ["NEXT_PUBLIC_APP_URL", ...Object.values(OVERRIDE_VARS)];
+let saved: Record<string, string | undefined>;
+
+beforeEach(() => {
+  saved = Object.fromEntries(TOUCHED.map((k) => [k, process.env[k]]));
+  for (const k of TOUCHED) delete process.env[k];
+});
+
+afterEach(() => {
+  for (const k of TOUCHED) {
+    if (saved[k] === undefined) delete process.env[k];
+    else process.env[k] = saved[k];
+  }
+});
+
+describe("getIntegrationCallbackUrls", () => {
+  it("derives ${NEXT_PUBLIC_APP_URL}/api/<provider>/callback when nothing overrides it", () => {
+    process.env.NEXT_PUBLIC_APP_URL = "https://health.example";
+    const urls = getIntegrationCallbackUrls();
+    for (const provider of INTEGRATION_CALLBACK_PROVIDERS) {
+      expect(urls[provider], provider).toBe(
+        `https://health.example/api/${provider}/callback`,
+      );
+    }
+  });
+
+  it("lets the explicit <PROVIDER>_REDIRECT_URI win over the derived form", () => {
+    // Withings / WHOOP / Polar / Oura / Strava accept any explicit value.
+    process.env.NEXT_PUBLIC_APP_URL = "https://health.example";
+    for (const provider of [
+      "withings",
+      "whoop",
+      "polar",
+      "oura",
+      "strava",
+    ] as const) {
+      process.env[OVERRIDE_VARS[provider]] =
+        `https://edge.example/api/${provider}/callback`;
+    }
+    const urls = getIntegrationCallbackUrls();
+    for (const provider of [
+      "withings",
+      "whoop",
+      "polar",
+      "oura",
+      "strava",
+    ] as const) {
+      expect(urls[provider], provider).toBe(
+        `https://edge.example/api/${provider}/callback`,
+      );
+    }
+    // No override for these two, so they still derive.
+    expect(urls.fitbit).toBe("https://health.example/api/fitbit/callback");
+    expect(urls["google-health"]).toBe(
+      "https://health.example/api/google-health/callback",
+    );
+  });
+
+  it("uses the explicit Fitbit / Google Health override when the app URL is unset", () => {
+    // Those two pin an explicit override to the app origin when both are set;
+    // with only the override present it is taken verbatim.
+    process.env.FITBIT_REDIRECT_URI =
+      "https://edge.example/api/fitbit/callback";
+    process.env.GOOGLE_HEALTH_REDIRECT_URI =
+      "https://edge.example/api/google-health/callback";
+    const urls = getIntegrationCallbackUrls();
+    expect(urls.fitbit).toBe("https://edge.example/api/fitbit/callback");
+    expect(urls["google-health"]).toBe(
+      "https://edge.example/api/google-health/callback",
+    );
+  });
+
+  it("reports null for a provider whose redirect URI fails validation, leaving the rest intact", () => {
+    // Fitbit refuses a plain-http, non-loopback origin; the others do not
+    // validate and keep deriving.
+    process.env.NEXT_PUBLIC_APP_URL = "http://health.example";
+    const urls = getIntegrationCallbackUrls();
+    expect(urls.fitbit).toBeNull();
+    expect(urls["google-health"]).toBeNull();
+    expect(urls.withings).toBe("http://health.example/api/withings/callback");
+    expect(urls.whoop).toBe("http://health.example/api/whoop/callback");
+  });
+});
diff --git a/src/lib/integrations/callback-urls.ts b/src/lib/integrations/callback-urls.ts
new file mode 100644
index 000000000..d9e7036bf
--- /dev/null
+++ b/src/lib/integrations/callback-urls.ts
@@ -0,0 +1,78 @@
+/**
+ * The OAuth callback URL each BYO-key provider registers, resolved on the
+ * server at request time.
+ *
+ * Settings → Integrations shows two things built from this value: the
+ * copyable callback address in the redirect guide, and the notice that warns
+ * when the configured callback origin differs from the origin the browser is
+ * on. Both used to read `process.env.NEXT_PUBLIC_APP_URL` inside a
+ * `"use client"` module. Next.js inlines `NEXT_PUBLIC_*` into client bundles
+ * at build time, and the published image is built without that variable, so
+ * every self-hoster's bundle carried an empty base: the guide showed a bare
+ * path and the notice never rendered. Resolving here, in server code, reads
+ * the runtime env the operator actually set.
+ *
+ * Each entry is the exact value the provider's client sends as `redirect_uri`
+ * on the wire, through the same function, so what the page shows and what the
+ * handshake registers cannot drift apart. Fitbit and Google Health validate
+ * their URI and throw on a malformed configuration; here that surfaces as
+ * `null` (nothing would be registered), and the cards fall back to the fixed
+ * path for the guide and skip the origin comparison.
+ */
+
+import { getFitbitRedirectUri } from "@/lib/fitbit/client";
+import { getGoogleHealthRedirectUri } from "@/lib/google-health/client";
+import { getOuraRedirectUri } from "@/lib/oura/client";
+import { getPolarRedirectUri } from "@/lib/polar/client";
+import { getStravaRedirectUri } from "@/lib/strava/client";
+import { getWhoopRedirectUri } from "@/lib/whoop/client";
+import { getWithingsRedirectUri } from "@/lib/withings/client";
+
+export const INTEGRATION_CALLBACK_PROVIDERS = [
+  "withings",
+  "whoop",
+  "fitbit",
+  "google-health",
+  "polar",
+  "oura",
+  "strava",
+] as const;
+
+export type IntegrationCallbackProvider =
+  (typeof INTEGRATION_CALLBACK_PROVIDERS)[number];
+
+/** `null` when the provider cannot produce a redirect URI from the current env. */
+export type IntegrationCallbackUrls = Record<
+  IntegrationCallbackProvider,
+  string | null
+>;
+
+const RESOLVERS: Record<IntegrationCallbackProvider, () => string> = {
+  withings: getWithingsRedirectUri,
+  whoop: getWhoopRedirectUri,
+  fitbit: getFitbitRedirectUri,
+  "google-health": getGoogleHealthRedirectUri,
+  polar: getPolarRedirectUri,
+  oura: getOuraRedirectUri,
+  strava: getStravaRedirectUri,
+};
+
+function resolve(provider: IntegrationCallbackProvider): string | null {
+  try {
+    return RESOLVERS[provider]();
+  } catch {
+    return null;
+  }
+}
+
+export function getIntegrationCallbackUrls(): IntegrationCallbackUrls {
+  return {
+    withings: resolve("withings"),
+    whoop: resolve("whoop"),
+    fitbit: resolve("fitbit"),
+    "google-health": resolve("google-health"),
+    polar: resolve("polar"),
+    oura: resolve("oura"),
+    strava: resolve("strava"),
+  };
+}
diff --git a/src/lib/whoop/client.ts b/src/lib/whoop/client.ts
index e3d7704b8..6419e0170 100644
--- a/src/lib/whoop/client.ts
+++ b/src/lib/whoop/client.ts
@@ -32,7 +32,7 @@ export interface WhoopCredentials {
   clientSecret: string;
 }
 
-function getRedirectUri(): string {
+export function getWhoopRedirectUri(): string {
   // `||`, not `??`: the compose whitelist materialises the var as an empty
   // string when unset, which must still fall through to the derived URI.
   return (
@@ -61,7 +61,7 @@ export function getAuthorizationUrl(
   const params = new URLSearchParams({
     response_type: "code",
     client_id: creds.clientId,
-    redirect_uri: getRedirectUri(),
+    redirect_uri: getWhoopRedirectUri(),
     scope: WHOOP_OAUTH_SCOPE,
     state,
   });
@@ -119,7 +119,7 @@ export async function exchangeCode(
       code,
       client_id: creds.clientId,
       client_secret: creds.clientSecret,
-      redirect_uri: getRedirectUri(),
+      redirect_uri: getWhoopRedirectUri(),
     }),
     "exchangeCode",
   );
diff --git a/src/lib/withings/client.ts b/src/lib/withings/client.ts
index c36b86d94..db6a41775 100644
--- a/src/lib/withings/client.ts
+++ b/src/lib/withings/client.ts
@@ -20,7 +20,7 @@ export interface WithingsCredentials {
   clientSecret: string;
 }
 
-function getRedirectUri(): string {
+export function getWithingsRedirectUri(): string {
   return (
     process.env.WITHINGS_REDIRECT_URI ??
     `${process.env.NEXT_PUBLIC_APP_URL}/api/withings/callback`
@@ -79,7 +79,7 @@ export function getAuthorizationUrl(
   const params = new URLSearchParams({
     response_type: "code",
     client_id: creds.clientId,
-    redirect_uri: getRedirectUri(),
+    redirect_uri: getWithingsRedirectUri(),
     scope: WITHINGS_OAUTH_SCOPE,
     state,
   });
@@ -105,7 +105,7 @@ export async function exchangeCode(
     grant_type: "authorization_code",
     client_id: creds.clientId,
     client_secret: creds.clientSecret,
-    redirect_uri: getRedirectUri(),
+    redirect_uri: getWithingsRedirectUri(),
     code,
   });