What is the explanations for the letters that come up after a credit card transaction? i.e. P, U, Y, Z, N, B, A, S.
You are likely referring to the AVS (Address Validation System) codes generated by your payment gateway. In the case of Authorize.net, following are some sample codes and explanations: A = Address (Street) matches, ZIP does not E = AVS error N = No Match on Address (Street) or ZIP R = Retry - System unavailable or timed out S = Service not supported by issuer U = Address information is unavailable W = 9 digit ZIP matches, Address (Street) does not X = Exact AVS Match Y = Address (Street) and 5 digit ZIP match Z = 5 digit ZIP matches, Address (Street) does not