A maybe stupid question: Is there a easy way to attach a non public visible message to a payment (maybe encrypted)? I would like to add Redcoin to my shop and if customers could send me their email together with a payment, that would make things easier. But I think most people won't be happy to make their email public, especially not in connection with kinky porn.
We are working on a payment gateway, but in the meantime you could make your signup system give them a unique order number, which they can attach for payment. either in the comments or as part of the payment amount
So when they join for R500, they are told to pay R500.6453 (6543 being a unique order number, or a number that relates to their email) or they can put that in the comments