Abstract: Codes, such as Quick Response (QR) codes, may be printed on a transaction receipt or displayed on a display unit of a workstation or self-service device (e.g., an ATM) to provide users with additional promotions or to service an error that may have occurred during the transaction. The code may be unique to the transaction and generated by the transaction device during the transaction. The code may encode information unique to the transaction, such as a unique identifier generated by the transaction device that links the code to a storage device storing additional information on the transaction. Users may scan the code to obtain additional promotion information or to contact a service agent to resolve an error.