Onlyfans You Need to Add Another Payment Card Error Means
An error or issue “You need to add another payment card” from OnlyFans means your card is denied as a payment method by Onlyfans.
Usually, you need to add another payment card error is caused by the used card, the card's account, technical issues, related to your payment card.
To solve you need to add another payment card error on Onlyfans, you either need to get a new card or fix the issue with the first payment card that you add to your Onlyfans account where you have to contact your card company or bank to review your account there.
Alternatively, the solution "you need to add another payment card" error related to your Onlyfans account is you must add another working card because OnlyFans doesn't currently have a working payment method to charge you for the creators contents that you are subscribing.