The methods and systems described herein provide for processing payments via a mobile device at a retail location while relying solely on non-PCI Scope information at the retail location. A payment processing transaction may be initiated at a point of sale at a retail location, and a unique identifier provided by a mobile device may be used as payment information to facilitate the processing of a payment transaction. Authorizations of payment processing transactions are made by a remotely located server based, at least in part, on the unique identifier provided by the mobile device.