Since there seems to be a small bit of confusion on the IPN let me clarify...
Paypal allows a system to tell the IPN server where to shoot the IPN for a specific transaction. If you have this integrated into the POST during the transaction then the server will shoot any and all IPNs concerning that transaction to the place where you tell it during the initial transaction. This allows you to bypass your IPN URL setting in your paypal profile, thus enabling you to use multiple versions of this (and other) systems for IPN logging.
I hope this helps to clarify things abit.
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