From their FAQ:

>Tell me about data portability. >That's not a question. We feel pretty strongly about data portability. We'll try to keep you with us by offering a better product than all of our competitors, but we won't keep you by locking you in. If you want to leave us for somebody else, we'll help you migrate your credit card data in a secure and PCI-compliant way. We're programmers at heart, and we strongly believe in open systems and a level playing field.