We switched from SalesOrders v2 to v3 for a client, using the service API token authorization. The orders keep failing, we get this error "Error: 500 - "" at createError. If we switch the same flow, same message and everything to our demo account, then order is posted fine. If we switch back to v2 with same order details, it is posted fine to customers account. Tested authentication and that is working fine, we can see the scope includes what is needed. Tested in in Postman and our integration tool, both just gives the same error.
... View more