itch.io

You should be able to buy PAIcom thru Patreon (thru credit card)
Just be sure you get the 5$ tier (or the more expensive ones) so you get the license.
(+ because you are doing it that way you also get your name in the PAIcom software for everyone to see)

Link: https://www.patreon.com/paicom

Thank you for checking my stuff out! ':D

Update: You can now also purchase PAIcom using any credit card right here on itch.io!

I hope I helped ya! ':D