diff --git a/LAUNCH_CHECKLIST.md b/LAUNCH_CHECKLIST.md
index 76b217533..5ce2c6b1e 100644
--- a/LAUNCH_CHECKLIST.md
+++ b/LAUNCH_CHECKLIST.md
@@ -101,14 +101,14 @@ production `assertEntitlementDurability()` **throws on boot** without Upstash.
 
 ### 1.5 Google OAuth + NextAuth (sign-in) — ✅ LIVE (providers 200)
 Verified 2026-07-14: `/api/auth/providers` returns Google and `/api/auth/csrf` returns a token, so `NEXTAUTH_SECRET` + Google creds are set in Production. Auth is Google-only and stays **off until `NEXTAUTH_SECRET` is set**.
-- Create a Google OAuth app (Authorized redirect URI:
-  `https://<domain>/api/auth/callback/google`).
+- Create a Google OAuth app and set Authorized redirect URI to the canonical
+  production callback: `https://uvai.io/api/auth/callback/google`.
 - Set in `apps/web/.env.local`:
   ```
   NEXTAUTH_SECRET=...            # openssl rand -base64 32
   NEXTAUTH_URL=https://<domain>
-  GOOGLE_OAUTH_CLIENT_ID=...
-  GOOGLE_OAUTH_CLIENT_SECRET=...
+  GOOGLE_CLIENT_ID=...
+  GOOGLE_CLIENT_SECRET=...
   ```
 - Decision: confirm Google-only sign-up is acceptable for paying customers
   (no email/password path exists today).
diff --git a/apps/web/.env.example b/apps/web/.env.example
index 31d0fd384..2bf2394e3 100644
--- a/apps/web/.env.example
+++ b/apps/web/.env.example
@@ -24,9 +24,8 @@ SUPABASE_SERVICE_ROLE_KEY=your-service-role-key
 # NextAuth / Google OAuth
 NEXTAUTH_URL=http://localhost:3000
 NEXTAUTH_SECRET=your-secret-here
-GOOGLE_OAUTH_CLIENT_ID=your-google-client-id.apps.googleusercontent.com
-GOOGLE_OAUTH_CLIENT_SECRET=your-google-client-secret
-# GOOGLE_CLIENT_ID / GOOGLE_CLIENT_SECRET are also supported.
+GOOGLE_CLIENT_ID=your-google-client-id.apps.googleusercontent.com
+GOOGLE_CLIENT_SECRET=your-google-client-secret
 
 # Stripe (test keys for local; production via Vercel env)
 STRIPE_SECRET_KEY=sk_test_...
diff --git a/apps/web/src/lib/__tests__/auth-config-source.test.ts b/apps/web/src/lib/__tests__/auth-config-source.test.ts
index e2b687de3..d6fe86307 100644
--- a/apps/web/src/lib/__tests__/auth-config-source.test.ts
+++ b/apps/web/src/lib/__tests__/auth-config-source.test.ts
@@ -15,12 +15,16 @@ describe('auth configuration source safety', () => {
     expect(source).not.toContain("signIn: '/api/auth/signin'");
   });
 
-  it('accepts both project-specific and common Google OAuth env names', () => {
+  it('uses a single Google OAuth env naming convention', () => {
     const source = readSource('lib/auth.ts');
-    expect(source).toContain('GOOGLE_OAUTH_CLIENT_ID');
-    expect(source).toContain('GOOGLE_CLIENT_ID');
-    expect(source).toContain('GOOGLE_OAUTH_CLIENT_SECRET');
-    expect(source).toContain('GOOGLE_CLIENT_SECRET');
+    expect(source).toContain("const googleClientId = (process.env.GOOGLE_CLIENT_ID || '').trim();");
+    expect(source).toContain(
+      "const googleClientSecret = (process.env.GOOGLE_CLIENT_SECRET || '').trim();",
+    );
+    expect(source).not.toContain('process.env.GOOGLE_OAUTH_CLIENT_ID || process.env.GOOGLE_CLIENT_ID');
+    expect(source).not.toContain(
+      'process.env.GOOGLE_OAUTH_CLIENT_SECRET || process.env.GOOGLE_CLIENT_SECRET',
+    );
   });
 
   it('keeps the root route as a landing page instead of redirecting to the app', () => {
diff --git a/apps/web/src/lib/auth.ts b/apps/web/src/lib/auth.ts
index bc6cac564..6c1b94f68 100644
--- a/apps/web/src/lib/auth.ts
+++ b/apps/web/src/lib/auth.ts
@@ -4,23 +4,14 @@ import type { NextAuthOptions } from 'next-auth';
 import GoogleProvider from 'next-auth/providers/google';
 
 const allowedDomain = process.env.AUTH_ALLOWED_EMAIL_DOMAIN?.trim().toLowerCase();
-const googleClientId = (
-  process.env.GOOGLE_OAUTH_CLIENT_ID ||
-  process.env.GOOGLE_CLIENT_ID ||
-  ''
-).trim();
-const googleClientSecret = (
-  process.env.GOOGLE_OAUTH_CLIENT_SECRET ||
-  process.env.GOOGLE_CLIENT_SECRET ||
-  ''
-).trim();
+const googleClientId = (process.env.GOOGLE_CLIENT_ID || '').trim();
+const googleClientSecret = (process.env.GOOGLE_CLIENT_SECRET || '').trim();
 
 /**
  * NextAuth configuration (Google OAuth by default).
  *
  * Required env to activate login-gating: NEXTAUTH_SECRET, NEXTAUTH_URL,
- *   GOOGLE_OAUTH_CLIENT_ID, GOOGLE_OAUTH_CLIENT_SECRET.
- * Also accepts NextAuth's common GOOGLE_CLIENT_ID / GOOGLE_CLIENT_SECRET names.
+ *   GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET.
  * Optional: AUTH_ALLOWED_EMAIL_DOMAIN restricts sign-in to a single domain
  *   (e.g. `yourcompany.com` → only *@yourcompany.com).
  *
@@ -28,10 +19,21 @@ const googleClientSecret = (
  * in proxy.ts is provider-agnostic (it only checks for a valid JWT session).
  */
 function buildProviders(): NextAuthOptions['providers'] {
+  if (process.env.NODE_ENV === 'production') {
+    if (
+      process.env.GOOGLE_OAUTH_CLIENT_ID ||
+      process.env.GOOGLE_OAUTH_CLIENT_SECRET
+    ) {
+      console.error(
+        '[auth] Deprecated Google OAuth env vars detected. Use GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET in Vercel production.',
+      );
+    }
+  }
+
   if (!googleClientId || !googleClientSecret) {
     if (process.env.NODE_ENV === 'production') {
       console.error(
-        '[auth] Google OAuth client id/secret missing — set GOOGLE_OAUTH_CLIENT_ID / GOOGLE_OAUTH_CLIENT_SECRET or GOOGLE_CLIENT_ID / GOOGLE_CLIENT_SECRET.',
+        '[auth] Google OAuth client id/secret missing — set GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET in Vercel production.',
       );
     }
   }