I'de to add the Content-Type of the headers in order to get it working. See: https://github.com/paperless-ngx/paperless-ngx/discussions/7580

Post-Consume-Script-Examples.md

@@ -28,7 +28,10 @@ def _set_auth_tokens(paperless_url: str, timeout: float, session: requests.Sessi
     response = session.post(
         paperless_url + "/api/token/",
         data=json.dumps(credentials),
-        headers={"X-CSRFToken": csrf_token},
+        headers={
+            "X-CSRFToken": csrf_token,
+            "Content-Type": "application/json"
+        },
         timeout=timeout,
     )
     response.raise_for_status()
@@ -75,6 +78,7 @@ if __name__ == "__main__":
         # Update the document
         resp = sess.patch(
             paperless_url + f"/api/documents/{doc_pk}/",
+            headers={"Content-Type": "application/json"},
             data=json.dumps({"correspondent": new_correspondent, "document_type": new_doc_type}),
             timeout=timeout,
         )