As far as I am aware you aren't allowed to store credit card numbers yourself without a weekly security audit from the card issuer...
- [flexcoders] Credit Card number encryption Christophe
- [flexcoders] Re: Credit Card number encryption valdhor
- Re: [flexcoders] Credit Card number encryption W.R. de Boer
- [flexcoders] Re: Credit Card number encryption Flex
- Re: [flexcoders] Credit Card number encryption Laurence MacNeill
- Re: [flexcoders] Credit Card number encryption Lee Jenkins

