A method and system for routing transactions to a mobile-commerce platform is described. One illustrative embodiment receives, via a network, a purchase request from a user's mobile communication device; authenticates the user to the mobile-commerce platform; generates a one-time-use perishable transaction code associated with the purchase request; prefixes to the transaction code an Issuer Identification Number (IIN) corresponding to the mobile-commerce platform to form a combined number; returns the combined number to the user's mobile communication device via the network to enable the user to provide the combined number to a merchant's point-of-sale system in connection with a transaction corresponding to the purchase request; and receives, via a payment network in communication with the merchant's point-of-sale system, the transaction code and transaction details associated with the transaction, the IIN informing the payment network to route the one-time-use perishable transaction code and the transaction details to the mobile-commerce platform.