Quote:
Originally posted by The Hun
The checksum thing is only used to block cards. If the billing company that is going to do the billing for this has ways of blocking cards then that is what can be used. People shouldn't be able to sign up more than once with one creditcard.
I'm sure I can come up with a system to check people.
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Why donīt you just blacklist the submitters sponsor links?
Like :
http://www.sponsor.com?ref=xxx