Permission Denied when using Upload API
I'm trying out video uploading using the Platform API, and am getting a 403 error code and this response:
message: "Not authorized to make this call"
title: "Permission Denied"
My upload request looks like this:
Are any specific HTTP headers required? Am I missing a parameter, or a setting in my account? I have looked at the Python kit upload example and the request that gets generated, and I can't see anything obvious. I'm not sure what I'm doing wrong with the request, as the API docs are quite sparse on detail.