Introduction to Paid Subscriptions 
The Paid Subscriptions system present in vBulletin allows the owner of the board the opportunity to create income via the forums.

Payment is processed automatically via the various online processors that support a call back to a user defined script, this allows the system to be virtually maintenance free.
If you run vBulletin with any sort of HTTP authentication system then the callback by the online processors will be subject to the same conditions and the subscription will not go through.
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