A computer-implemented method includes: installing a first message protocol on a transaction terminal based on a provider thereof; installing an adapter layer on the terminal, the adapter layer including a mapping from the first message protocol to a standard message protocol; reading payment data from a payment device, the payment data associated with a transaction; generating a message including the payment data according to the first message protocol; translating the message from the first message protocol to the standard message protocol with the adapter layer to form a transaction message; and communicating the transaction message to a transaction processing system.