A data processing center (DPC) computer receives billing information, including a mobile telephone number, and a bill issuance notification request from an acquirer computer. The DPC computer then determines, based on the mobile telephone number, a mobile payment platform (MPP) computer having an account holder as a customer, transmits the billing information to the MPP computer for relaying a billing issuance notification to a mobile device of the account holder, and then receives information indicating that the account holder has been authenticated and has elected to pay the bill associated with the billing issuance notification. The DPC computer then determines a payment card account number of the account holder, and transmits it to the acquirer computer for bill payment processing.