Marky,
Most third party billing companies have some type of interface that you can get post back information from, for example, the paypal automatic subscription rebilling has such a mechanism. For lack of a better term, it is simply an api (application programming interface) designed to allow two unlike systems to communicate with each other.
I am sure that now, with all the visa changes, that you will see more robust interfaces to help seamlessly integrate paysites with their third party billing provider.
Midnight
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