I need to add some extra meta when a user registers via the Universal login. Preferably app_metadata, but I’d even accept user_metadata. The key point is that it should not show up as an extra field on the form, but instead, just be passed along when the user is created, so I don’t think additionalSignUpFields can be used here.
The reason I want to do this is that I need to check for a metadata value during the post-registration hook, to determine whether or not to fire a function there. In particular, I need to see the callback URL, as it could come from more than one source.
Anyone know how to do that?