Supporter/Membership plugin and Expired Credit Cards

Hi,

I have a few question about the supporter or membership plugin.

Say if a customer purchases a “pro” membership using PayPal, and then their credit card expires, or their PayPal account doesn’t have enough for the recurring transaction to succeed, what happens to the customer’s membership?

Also too, can the customer be offered the choice to pay by credit card or PayPal Express?

Thanks,

Mike