If you've publicly released a plugin here on the forums, hit up the #verification
channel and post a link to your release(s) to get the Plugin Author
Edit (March 2020): The Discord now has a special AM Donor
AlliedModders supporters can now obtain a donor role as a thank you for helping us pay for the infrastructure which we rely on to host the forums and build slaves. If you'd like to donate please visit https://sourcemod.net/donate.php
Donors who contribute at least $5 can claim the role by linking their forum account and discord account using this link:
IRC is for squares, man.