I am trying to implement Taxonomy calls as Trading API Item Specifics is going away. I have converted all my trading API calls to OAuth2 successfully, but Taxonomy calls like getDefaultCategoryTreeId are returning HTTP 400. My call details:
scheme: GET
uri: https://api.sandbox.ebay.com/commerce/taxonomy/v1/get_default_category_tree_id?marketplace_id=EBAY_US&
headers: Authorization:Bearer v^1.1#i^...dBkAAA==
Accept:application/json
Content-Type:application/json
Accept-Encoding:gzip
payload: [empty]
I have spent much time on this, and any help is greatly appreciated.