diff --git a/packages/core/handlers/app-handler-helpers.js b/packages/core/handlers/app-handler-helpers.js
index cde6bc7d1..66a2b75cf 100644
--- a/packages/core/handlers/app-handler-helpers.js
+++ b/packages/core/handlers/app-handler-helpers.js
@@ -19,6 +19,11 @@ const createApp = (applyMiddleware) => {
         })
     );
 
+    app.use((req, res, next) => {
+        console.log(`[Frigg] ${req.method} ${req.path}`);
+        next();
+    });
+
     if (applyMiddleware) applyMiddleware(app);
 
     // Handle sending error response and logging server errors to console
@@ -29,6 +34,8 @@ const createApp = (applyMiddleware) => {
         } = boomError;
 
         if (statusCode >= 500) {
+            console.error(`[Frigg] ${req.method} ${req.path} -> ${statusCode}: ${err.message}`);
+            console.error(err.stack);
             flushDebugLog(boomError);
             res.status(statusCode).json({ error: 'Internal Server Error' });
         } else {
diff --git a/packages/core/modules/module.js b/packages/core/modules/module.js
index 8bf95a03c..3d4a04235 100644
--- a/packages/core/modules/module.js
+++ b/packages/core/modules/module.js
@@ -92,6 +92,7 @@ class Module extends Delegate {
         try {
             if (await this.testAuthRequest(this.api)) validAuth = true;
         } catch (e) {
+            console.error(`[Frigg][testAuth] Failed for module ${this.name}: ${e.message}`);
             flushDebugLog(e);
         }
         return validAuth;
diff --git a/packages/core/modules/use-cases/process-authorization-callback.js b/packages/core/modules/use-cases/process-authorization-callback.js
index 77bc682c4..61feadcd0 100644
--- a/packages/core/modules/use-cases/process-authorization-callback.js
+++ b/packages/core/modules/use-cases/process-authorization-callback.js
@@ -15,6 +15,8 @@ class ProcessAuthorizationCallback {
     }
 
     async execute(userId, entityType, params) {
+        console.log(`[Frigg][OAuth] Starting callback for entityType=${entityType}, userId=${userId}`);
+
         const moduleDefinition = this.moduleDefinitions.find((def) => {
             return entityType === def.moduleName;
         });
@@ -34,26 +36,37 @@ class ProcessAuthorizationCallback {
             definition: moduleDefinition,
         });
 
+        const authType = module.apiClass.requesterType;
+        console.log(`[Frigg][OAuth] Module created: name=${module.getName()}, authType=${authType}`);
+
         let tokenResponse;
-        if (module.apiClass.requesterType === ModuleConstants.authType.oauth2) {
+        if (authType === ModuleConstants.authType.oauth2) {
+            console.log(`[Frigg][OAuth] Exchanging authorization code for token...`);
             tokenResponse = await moduleDefinition.requiredAuthMethods.getToken(
                 module.api,
                 params
             );
+            console.log(`[Frigg][OAuth] Token exchange successful, keys: ${Object.keys(tokenResponse || {}).join(', ')}`);
         } else {
+            console.log(`[Frigg][OAuth] Setting auth params (non-OAuth2)...`);
             tokenResponse =
                 await moduleDefinition.requiredAuthMethods.setAuthParams(
                     module.api,
                     params
                 );
             await this.onTokenUpdate(module, moduleDefinition, userId);
+            console.log(`[Frigg][OAuth] Auth params set and credential persisted`);
         }
 
+        console.log(`[Frigg][OAuth] Testing auth...`);
         const authRes = await module.testAuth();
         if (!authRes) {
+            console.error(`[Frigg][OAuth] testAuth() returned false — authorization failed`);
             throw new Error('Authorization failed');
         }
+        console.log(`[Frigg][OAuth] Auth test passed`);
 
+        console.log(`[Frigg][OAuth] Fetching entity details...`);
         const entityDetails =
             await moduleDefinition.requiredAuthMethods.getEntityDetails(
                 module.api,
@@ -61,17 +74,20 @@ class ProcessAuthorizationCallback {
                 tokenResponse,
                 userId
             );
+        console.log(`[Frigg][OAuth] Entity details received: identifiers=${JSON.stringify(entityDetails.identifiers)}`);
 
         Object.assign(
             entityDetails.details,
             module.apiParamsFromEntity(module.api)
         );
 
+        console.log(`[Frigg][OAuth] Finding or creating entity...`);
         const persistedEntity = await this.findOrCreateEntity(
             entityDetails,
             entityType,
             module.credential.id
         );
+        console.log(`[Frigg][OAuth] Done — entity_id=${persistedEntity.id}, credential_id=${module.credential.id}`);
 
         return {
             credential_id: module.credential.id,
diff --git a/packages/core/user/use-cases/authenticate-user.js b/packages/core/user/use-cases/authenticate-user.js
index c7dee175e..cc359de86 100644
--- a/packages/core/user/use-cases/authenticate-user.js
+++ b/packages/core/user/use-cases/authenticate-user.js
@@ -2,12 +2,12 @@ const Boom = require('@hapi/boom');
 
 /**
  * Use case for authenticating a user using multiple authentication strategies.
- * 
+ *
  * Supports three authentication modes in priority order:
  * 1. Shared Secret (backend-to-backend with x-frigg-api-key + x-frigg headers)
  * 2. Adopter JWT (custom JWT authentication)
  * 3. Frigg Native Token (bearer token from /user/login)
- * 
+ *
  * x-frigg-appUserId and x-frigg-appOrgId headers are automatically supported
  * for user identification with any auth mode. When present with JWT or Frigg
  * tokens, they are validated to match the authenticated user.
@@ -50,12 +50,18 @@ class AuthenticateUser {
         const authModes = this.userConfig.authModes || { friggToken: true };
         const appUserId = req.headers['x-frigg-appuserid'];
         const appOrgId = req.headers['x-frigg-apporgid'];
-        let user = null;
+        console.log(
+            '[Frigg] header list:',
+            JSON.stringify(Object.keys(req.headers))
+        );
 
         // Priority 1: Shared Secret (backend-to-backend with API key)
         if (authModes.sharedSecret !== false) {
             const apiKey = req.headers['x-frigg-api-key'];
             if (apiKey) {
+                console.log(
+                    '[Frigg] Attempting shared secret authentication with API key'
+                );
                 // Validate the API key (authentication)
                 await this.authenticateWithSharedSecret.execute(apiKey);
                 // Get user from x-frigg headers (authorization)
@@ -64,6 +70,9 @@ class AuthenticateUser {
                     appOrgId
                 );
             }
+            console.log(
+                '[Frigg] No x-frigg-api-key header found, skipping shared secret authentication'
+            );
         }
 
         // Priority 2: Adopter JWT (if enabled)
@@ -71,10 +80,11 @@ class AuthenticateUser {
             authModes.adopterJwt === true &&
             req.headers.authorization?.startsWith('Bearer ')
         ) {
+            console.log('[Frigg] Attempting Adopter JWT authentication');
             const token = req.headers.authorization.split(' ')[1];
             // Detect JWT format (3 parts separated by dots)
             if (token && token.split('.').length === 3) {
-                user = await this.getUserFromAdopterJwt.execute(token);
+                const user = await this.getUserFromAdopterJwt.execute(token);
                 // Validate x-frigg headers match JWT claims if present
                 if (appUserId || appOrgId) {
                     this.validateUserMatch(user, appUserId, appOrgId);
@@ -85,7 +95,8 @@ class AuthenticateUser {
 
         // Priority 3: Frigg native token (default)
         if (authModes.friggToken !== false && req.headers.authorization) {
-            user = await this.getUserFromBearerToken.execute(
+            console.log('[Frigg] Attempting Frigg native token authentication');
+            const user = await this.getUserFromBearerToken.execute(
                 req.headers.authorization
             );
             // Validate x-frigg headers match token user if present
@@ -123,5 +134,3 @@ class AuthenticateUser {
 }
 
 module.exports = { AuthenticateUser };
-
-