Transaction processing involves receiving data from an access transaction application of a portable consumer device, wherein the received data comprises data from an access transaction data string that includes a transit verification value wherein, with the exception of the transit verification value, the access transaction data string is substantially similar to a retail data string comprising retail data, wherein the access application data string is adapted for use with an access transaction processing system and the retail data string is adapted for use with a retail processing system. The transaction processing involves processing access transaction application data for selective authorization of the transaction.