If you take credit cards, you have to be PCI compliant. This is the Payment Card Industry security compliance to protect you and the system against fraud. Typically there is a short form and a long form depending on your store, network and configurations. Most BTCRetailX clients will just need the short form for compliance.
Card Connect / Clover Connect PCI Compliance
If you are a Card Connect / Clover Connect customer, go to:
Verifone/Media Payments Group PCI Compliance|