Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

PayPal wants me to “add a bank account”, another funding source. Credit card isn't working. Why?
It's always a good idea to check your credit history on a regular basis - try checking your credit score from one of the independent providers recently (like Equifax) ?  Maybe that will offer a clue what PayPal is doing.