I have AT&T and I can't get my verification code
AT&T does not block short code by default. It is possible that you have purposely or, accidentally blocked all short code messages.
Check the settings of your particular device. If you have Premium SMS blocked you can unblock it, or add rules for PAYOMATIC's short code number 58988 to be allowed.
If this does not work contact AT&T customer service at 1(800)331-0500 and ask to allow messages from 58988.