A method for processing a financial transaction includes: storing, in a database, a plurality of wallet data entries, wherein each wallet data entry includes at least a mobile device identifier and payment details associated with at least one payment account; receiving, by a receiving device, an authorization request for a financial transaction, wherein the authorization request includes at least a mobile device identifier and transaction data; transmitting, to a mobile computing device associated with the mobile device identifier, at least the transaction data; receiving, from the mobile computing device, an indication of a payment account for funding of the financial transaction; identifying, in the database, payment details associated with the indicated payment account in a wallet data entry including the mobile device identifier included in the authorization request; and transmitting, to an issuer associated with the indicated payment account, at least the payment details and the transaction data.