If you must store CC numbers be sure you client understands the risks. We have used CardCrypt and TextCrypt from Perth Web (http://developer.perthweb.com.au/) with good success. Just be sure you NEVER let the private key be stored on the server and NEVER use it without SSL. And NEVER let the private just lay around. The private key MUST be stored in a safe and secure loction just like you would the keys to a safe. I always suggest to clients they remove the CC numbers ASAP after they don't need them anymore like Bobby suggested #replace(ccnumber, ccnumber, "")#
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