diff --git a/src/loaders/oidcStandardRoutesMiddleware.ts b/src/loaders/oidcStandardRoutesMiddleware.ts
index dcae128..3ac7aa1 100644
--- a/src/loaders/oidcStandardRoutesMiddleware.ts
+++ b/src/loaders/oidcStandardRoutesMiddleware.ts
@@ -8,18 +8,28 @@ import { buildOidcConfig } from '../oidc/oidcConfigBuilder';
  * Compatible with express-knifey's middleware system
  */
 const loadDictElement: LoadDictElement<(path: string | '*') => void> = {
+  before: async ({ serviceLocator, deps }) => {
+    if (serviceLocator.couldLoad('oidcUserRegistrar')) {
+      const onUserAuthenticated = await serviceLocator.get('oidcUserRegistrar');
+      return { ...deps, onUserAuthenticated };
+    }
+    return deps;
+  },
   factory: ({
     app,
     logger,
     sessionService,
     appConfig,
-    redisClient
+    redisClient,
+    onUserAuthenticated
   }) => {
     // Build configuration using shared builder
+    const baseConfig = buildOidcConfig(appConfig, redisClient);
     const config = {
       logger,
       sessionService,
-      ...buildOidcConfig(appConfig, redisClient)
+      ...baseConfig,
+      ...(onUserAuthenticated ? { onUserAuthenticated } : {})
     };
 
     const router = createOidcStandardRoutes(config);
@@ -42,4 +52,4 @@ const loadDictElement: LoadDictElement<(path: string | '*') => void> = {
   }
 };
 
-export default loadDictElement;
\ No newline at end of file
+export default loadDictElement;
diff --git a/src/middleware.ts b/src/middleware.ts
new file mode 100644
index 0000000..0c38b33
--- /dev/null
+++ b/src/middleware.ts
@@ -0,0 +1,11 @@
+import type { MiddlewareHandle } from 'express-knifey';
+
+export const SWISSOID_MIDDLEWARE = {
+  oidcStandardRoutes: {
+    name: 'oidcStandardRoutesMiddleware',
+    defaultPriority: 50,
+    defaultPath: '*',
+  } satisfies MiddlewareHandle,
+} as const;
+
+export type SwissoidMiddlewareHandle = typeof SWISSOID_MIDDLEWARE[keyof typeof SWISSOID_MIDDLEWARE];
diff --git a/src/oidc/OIDCStandardRoutes.ts b/src/oidc/OIDCStandardRoutes.ts
index 6c4f884..2a3dba5 100644
--- a/src/oidc/OIDCStandardRoutes.ts
+++ b/src/oidc/OIDCStandardRoutes.ts
@@ -11,6 +11,14 @@ import { jwtVerify, createRemoteJWKSet, SignJWT } from 'jose';
  * Using stateless signed state to avoid third-party cookie issues
  */
 
+export interface OnUserAuthenticatedEvent {
+  claims: Record<string, any>;
+  tokenResponse: Record<string, any>;
+  request: Request;
+}
+
+type OnUserAuthenticatedHandler = (event: OnUserAuthenticatedEvent) => Promise<void>;
+
 interface OidcStandardConfig {
   logger: any;
   sessionService: any;
@@ -35,6 +43,9 @@ interface OidcStandardConfig {
 
   // State signing secret (should be different from session secret)
   stateSigningSecret: string;
+
+  // Optional hook invoked after id_token verification succeeds
+  onUserAuthenticated?: OnUserAuthenticatedHandler;
 }
 
 export function createOidcStandardRoutes(config: OidcStandardConfig): Router {
@@ -299,6 +310,19 @@ export function createOidcStandardRoutes(config: OidcStandardConfig): Router {
         return res.status(401).send('Nonce mismatch');
       }
 
+      if (config.onUserAuthenticated) {
+        try {
+          await config.onUserAuthenticated({
+            claims: payload,
+            tokenResponse: tokenData,
+            request: req,
+          });
+        } catch (handlerError) {
+          logger.error('onUserAuthenticated handler failed', handlerError);
+          return res.status(500).send('Unable to process user registration');
+        }
+      }
+
       // Clear the optional nonce cookie if it was set
       res.clearCookie('rp_nonce', getCookieOptions());
 
@@ -631,4 +655,4 @@ export function createOidcStandardRoutes(config: OidcStandardConfig): Router {
   router.post('/auth/logout', logoutHandler);
 
   return router;
-}
\ No newline at end of file
+}
diff --git a/src/oidc/oidcConfigBuilder.ts b/src/oidc/oidcConfigBuilder.ts
index 3f2ae0d..22b249c 100644
--- a/src/oidc/oidcConfigBuilder.ts
+++ b/src/oidc/oidcConfigBuilder.ts
@@ -29,4 +29,4 @@ export function buildOidcConfig(appConfig: SwissoidAppConfig, redisClient: Redis
     // State signing secret
     stateSigningSecret: appConfig.stateSigningSecret || appConfig.sessionSecret + '-state-signing'
   };
-}
\ No newline at end of file
+}