You have to make a synchronization between website and pvpgn accounts.
Disable /chpass command in pvpgn to disable change password inside a game (command_groups.conf > delete /chpass)
Disable register a new account from a game (bnetd.conf > new_accounts = false)
Crack all passwords from your pvpgn server to create accounts for your website auth method harpywar.pvpgn.pl/?do=api
When register new account on your website also create a new account in pvpgn database
When change password on your website do not forget change hash for the same account in pvpgn database
Tried what you said with UM Register, so i can establish permissions. But i cannot find the way to create account from the Website and then to autocreate account in PvPGN.
I tried by making queries via MySQL, but cannot make it work from a WordPress site... Anyone have an idea on how to achieve that without use PVPGN WebRegister???