diff --git a/src/auth/AuthGuard.ts b/src/auth/AuthGuard.ts
index 4d645a3..9db2ddc 100644
--- a/src/auth/AuthGuard.ts
+++ b/src/auth/AuthGuard.ts
@@ -59,7 +59,8 @@ export default abstract class AuthGuard<P extends AuthProof<User>> {
         session: Express.Session,
         proof: P,
         onLogin?: (user: User) => Promise<void>,
-        onRegister?: (connection: Connection, user: User) => Promise<RegisterCallback[]>,
+        beforeRegister?: (connection: Connection, user: User) => Promise<RegisterCallback[]>,
+        afterRegister?: (connection: Connection, user: User) => Promise<RegisterCallback[]>,
     ): Promise<User> {
         if (!await proof.isValid()) throw new InvalidAuthProofError();
         if (!await proof.isAuthorized()) throw new UnauthorizedAuthProofError();
@@ -72,9 +73,12 @@ export default abstract class AuthGuard<P extends AuthProof<User>> {
 
             user = await MysqlConnectionManager.wrapTransaction(async connection => {
                 const user = User.create({});
+                if (beforeRegister) {
+                    (await beforeRegister(connection, user)).forEach(c => callbacks.push(c));
+                }
                 await user.save(connection, c => callbacks.push(c));
-                if (onRegister) {
-                    (await onRegister(connection, user)).forEach(c => callbacks.push(c));
+                if (afterRegister) {
+                    (await afterRegister(connection, user)).forEach(c => callbacks.push(c));
                 }
                 return user;
             });
diff --git a/src/auth/magic_link/MagicLinkAuthController.ts b/src/auth/magic_link/MagicLinkAuthController.ts
index 7d44f4f..ea988d9 100644
--- a/src/auth/magic_link/MagicLinkAuthController.ts
+++ b/src/auth/magic_link/MagicLinkAuthController.ts
@@ -23,7 +23,7 @@ export default abstract class MagicLinkAuthController extends AuthController {
         // Auth
         try {
             return await req.as(AuthMiddleware).getAuthGuard().authenticateOrRegister(
-                session, magicLink, undefined, async (connection, user) => {
+                session, magicLink, undefined, undefined, async (connection, user) => {
                     const callbacks: RegisterCallback[] = [];
 
                     const userEmail = UserEmail.create({