A point of sale (POS) device may be configured to locate a payment system and transmit a payment authorization request from a remote location to a payment system, either directly, or via a payment system directory and/or a SSL Gateway. The invention also includes inserting third party account information into an encrypted portion of the payment request, so the payment request appears as a normal request to the issuing bank, but the third party account information may be used by the third party to bill the customer. The payment system directory is further configured to determine one or more payment processors to direct a payment authorization request, such that a single transaction may me allocated among multiple payment processors for authorization. Moreover, the payment system directory is able to format alternative payment methods into a format that is able to be processed over existing payment networks.