@Harvey thanks for your contributions.l have been following the discussion after encountering the same issue.Unfortunately l m stuck here now ,l am not figuring out how to use the information on the link you shared.
Invalid Hash When Initiating a RemoteTransaction
Harvey
#22
@Byro this is a good place to start. Have you used Postman before ?
Initiate A Transaction [ Error ]
Byro
#27
@Harvey I got to the stage of importing postman collection.Looks like l not figuring out how.
Getting a HashMismatchException