I am getting the same error while using Copybook Data Protocol .I had created Copybook bundle from Dev test portal . Workstation log getting error message "[AWT-EventQueue-0] WARN com.itko.util.copybook.PayloadProcessor - Couldn't find a payload mapping, "
This message means that the request message couldn't be matched to a copybook definition file. If you up the logging level from INFO to DEBUG in logging.properties you will get more information in your Workstation log file regarding the parsing of the message. If you need even more information TRACE will churn out a lot of information and show you down to a field level how things are being parsed. There is likely either a mistake in your payload mapping file or the req/rsp messages you've specified don't align to a specific copybook definition you have available.
Adding to Josh point, i will suggest, go bit by bit process,
Like first try to parse your request only by proving payload mapping file with single payload details like below
Payload name=operation-req type=request key=abcdxyz
Your key is important and it should be available in the request.
This error sometime comes due to if there is no match in key properly.
If still you get error, might b try to check if your copybook file parsing into Xml is happening properly.
@ AnkushSharma62132828 , how did you managed to rectify this issue?