PayPal:
Recently PayPal is refusing NSFW's payment to new PayPal account users. As far as I know, there is no solution for PayPal.
Credit Card:
(1) If credit card payment fails, it can be solved by calling a bank or a credit card company. According to reports from subscribers, it was most effective when calling a bank rather than a credit card company.
(2) There have been reports from subscribers that the debit card has a slightly higher probability of successful payment.
(3)You can't use prepaid cards.