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We use our own hand-crafted set of scripts to manage our iBill and CCBill signups. The pincode verification part of it is very simple, we have a mysql table, that has the follow fields: (subaccount,plan,used). We just run the query 'select 1 from pins where subaccount=XXX and plan=XXX and used=N' to see if a pin is valid or not. If its good, we just set the 'used' field to yes and create the account.
IBill also supports pin verification through their DirectIntegration system. We haven't used that, but it would seem to elimiate the need to maintain a list of pincodes locally.
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