I run a site that does monthly credit card re-billing and our solution was to store a "last-billed" UNIX timestamp in the database, and then query the database for users that have a "last billed" date on a certain day of the month. (That is, if it's the 10th of the month, look for last billed dates that are the 10th of the last month.) This system works great except for people who originally subscribe on the 29th, 30th, or 31st of the month... to take care of them we just bill all those people on the 28th. Easy peasey. Missed transactions (or failed transactions) are easy to track because we always know the last date a successful billing occurred. No need to set a separate flag.

I suppose I don't need to remind you that if you're going to be storing credit card numbers for God's sake don't store them anywhere within your web server's file tree... yes, I know you're encrypting them but it's always good practice to make it as hard as possible to even get to the cc numbers in the first place.

Gary Blackburn
Trained Killer

In reply to Re: Credit Card Billing by Trimbach
in thread Credit Card Billing by Anonymous Monk

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