Why can't I add payment method on Facebook?
If you're having trouble adding a new credit card to your account, please make sure that the credit card number, expiration date, CSV number and other payment information are correct. If you receive an error that says you have too many cards on file or if you're still having trouble, please contact us.
How do I add a payment method?
How to add a payment method to your Google Play account.
On your Android phone, go to your payment methods in Google Play..
Tap Add a payment method..
Choose the payment method you want to add..
Follow the on-screen instructions..