Hello,
the database-table "users" does not exist. Phpay just
creates the table "user" which is actually not a very good
name.
Many applications, e.g. VBB, use this tablename. You
won't be warned if you install phpay and overwrites
existing user-tables!!!
publicpay.inc.php(5): $user_result = db_query("select *
from users where ID='$user_ID'") or db_die();