A method for processing a transaction, comprising: receiving, by an aggregator from a merchant, a transaction data signal electronically transmitted via a communication network; transmitting, by the aggregator to a mobile network operator (MNO), an authorization message; receiving, by the aggregator from the MNO, an approval transaction data signal; transmitting, by the aggregator to a payment network, a request message configured to indicate a virtual card number (VCN) request associated with the MNO's transaction account for the transaction amount; receiving, by the aggregator from the payment network, a VCN transaction data signal; and transmitting, to the payment network, a VCN message indicating the VCN initiation of a payment transaction.