maybe the answer here is for the paysite to create an user/pwd for the user before sending them to PWC, the the postback should work as a u/p would be passed along with the link to PWC
The postback may look like
{
paysite:
txn:
userId:
Plan:
Type: ( single, Recurring )
Amount:
Fee:
Net:
Token:
IP:
timestamp:
}
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