What payment gateways do you use for your app?
retroryan: I am trying to figure out if I want to accept credit cards on my site, instead of sending the customer to a different site, how I can become PCI Compliant.  It sounds like for a low volume of transactions you just have to answer a questioner and keep decent security precautions.  Is that true?  Also does your host have to be PCI Certified or can it be any VPS host like linode?