Itch.io only lets me use PayPal as a payment method,
but I don't even have a PayPal account anymore (it was banned, and there's nothing I can do about it).
Is there another store where you're selling this asset that accepts credit cards?
Evidently, due to Stripe complaining about adult content, the "Pay with Card" option for a lot of adult stuff (this included) has been disabled, and there's nothing I can do to get around that, I'm sorry.
/t/5149036/reindexing-adult-nsfw-content
