Hello,
I would like to restrict registrations to use username, auth. username
and password fields all together.
My problem:
If the user sets in his device the auth. username and password, it's
enough for registration. However he can set whatever username, which I
don't want to allow, while I would like to use numbers and don't want
that anybody misuse this.
Any idea how to do that?
Kind regards,
Tamas