What do the BrainTree response codes mean? November 17, 2016 18:11 BrainTree has a great list of all of their response codes with additional information on each of them and potential next steps to take to resolve the issue. It can be found here. Related articles How to troubleshoot the spinning authorization indicator in SimpleePAY What are the Vantiv Element Express response codes? What do the Vantiv response codes mean?