When your supporters enter their credit card information on Flipcause, it's tokenized and encrypted, and stored in your Contact Profile's Payment Sources.
You can view these payment sources (but not ever view full credit card details), as well as add new payment sources manually. You can then use these to process additional purchases, donations, and payments. This area is located toward the bottom right-hand side of your Contact Profile page.
You can also remove a payment source by clicking the View icon to the right and then selecting Remove This Card.