Module Options:Payment Viewer
MODULE OPTIONS
Some aspects of the 
Payment Viewer module can be customized by opening the module, clicking the Tools menu, and then selecting Module Options.
Credit Card Processing tab
- The data required to process a payment can be customized in the Credit Card Requirements section.
- Credit card number must be valid
- Security code (CV2 #)
- Name on card
- Billing address
- Billing postal code
- Billing country code
- Hide credit card number
- When this option is on, all but the last four digits of a credit card number will be hidden for all users.