Callback Function upon account creation

Is there a way to execute a Function when a new account has been created, as a type of callback?

Yes,

You'll need to set trigger for your function.

Here you can see all avaiable account events
https://appwrite.io/docs/events#authentication-events

You'll probably use this one
users.*.create = This event triggers when a user is created

You can set the trigger to the function either in the function settings page 👇.

Or in the appwrite.json file that you'll have after you've initiate the function using the cli as you can see here;
https://appwrite.io/docs/functions#gettingStarted

Thanks!!

Amazing responsiveness ❤️

I'll dive into the docs