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PayPal wants me to “add a bank account”, another funding source. Credit card isn't working. Why?
I've used PayPal for my business for a long time. Sometimes PayPal doesn't trust credit cards. Debit or direct bank transfer are reliable. There is also a charge for using a credit card but I don't think that is the reason. You may be trying to purchase a high value item. That would be a possible reason why PayPal allowed you to use credit cards in the past, but will not allow you to do so now, for these particular transactions.