At this point mp must be well versed in how to handle payment processor, because the hardest part of running i filehost is protecting your payment processing, ive had users tell me they cannot buy access, and then they try again 5 hours later and it suddenly gave them the option to purchase... my guess its many metrics that go into determine if a specific user is illegible for purchase, you have to understand much of the people wanting to pay are nefarious users, using stolen credit cards or what not, to allow these users to make purchase will render your relationship with the payment processor null, they will kick you out headfirst and not make business with you again, so its on the filehost responsibility to make sure each purchase is a safe purchase, so for MP its worth it in the end losing a few sales but make sure the sales they do get are valid.