I know you are looking for answer but i wanted to discuss about OEOrders POST API. Even after mapping all the fields that were required I am still getting "InternalServerError". I looked on the internet and its said this issue occurs for 2 reasons. Either credentials are wrong or rights are not given. But I have checked and we have been given rights and we are using the same credentials which we did use to successfully create customers in Sage using POST API.
I also tried directly inserting into database but no Luck. The records is inserted into database but when we search for it on Sage against Order number we are not able to find it.
If you can please help, I would be grateful