I'm trying to use the REST API bulkCreateOrUpdate with POST but it doesn't work.
First, I used the login API to get the sessionId token. I also created a import map and I took the original ID as mapId. Finally, I inserted a CSV as body of the request.
But the response I get when I send the request is :
Although, I know my mapId is existing.
What can I do?
In advance, thanks for your help.