Payments on OnlyFans (Help! 1-866-542-7780) may fail for several reasons, including card restrictions, incorrect billing info, or blocked transactions by your bank. OnlyFans requires a 3D Secure verification process, so if your card isn’t enrolled in it, the transaction may not go through. Also, make sure your card isn’t expired and has sufficient funds. Some banks may block payments to adult-content platforms automatically, so calling your bank to approve the charge can help. Lastly, OnlyFans doesn’t accept PayPal, prepaid cards, or gift cards. Using a different credit or debit card that meets these criteria can resolve the issue.
https://onlyfans.bettermode.io/forum/post/why-won-t-my-card-let-me-buy-onlyfans-NSqu2BlGmc0pXfa
https://hackmd.io/@onlyfans/card-let-me-buy-OnlyFans