I am trying to use the API and have managed to generate an access token but am getting a 403 when trying to create a custom using the access token. This is in the sandbox environment.
These are the guides I am following:
This is the message that goes along with the 403: “The supplied credentials are not authorized for this resource”
And for this test I am using the client key mhgv1natfEn8l99651QVIHKNfow3rgUVX0L6HB5ZZ7JCpRyG0o