diff --git a/src/data.ts b/src/data.ts
index d841353..5c081bc 100644
--- a/src/data.ts
+++ b/src/data.ts
@@ -1,3 +1,4 @@
+import { v4 } from 'uuid';
 import { IonProfile } from './auth_ion';
 
 /**
@@ -76,5 +77,15 @@ export async function getUserByEmail(
 export async function registerUserFromIonProfile(
 	profile: IonProfile
 ): Promise<string> {
-	return 'new_user_0';
+	const id = v4();
+	const user: Carpool.User = {
+		id,
+		username: profile.ion_username,
+		email: profile.tj_email,
+		first_name: profile.first_name,
+		last_name: profile.last_name,
+	};
+	users[id] = user;
+	console.log('Registered user', user);
+	return id;
 }