Authorize. NET - Login - Merchant Interface Merchant Services provided by Truist Bank, Member FDIC Truist Financial Corporation Truist, Truist Purple, and the Truist Logo are service marks of Truist Financial Corporation
API Login ID and Transaction Key - Authorize. net Your API Login ID and Transaction Key are unique pieces of information specifically associated with your payment gateway account However, the API Login ID and Transaction Key are NOT used for logging into the Merchant Interface