Fix Seerr transport payload forwarding

backend/app/clients/base.py

@@ -113,7 +113,7 @@ class ApiClient:
                     url,
                     headers=self.headers(),
                     params=params,
-                    json=payload,
+                    payload=payload,
                 )
                 response.raise_for_status()
             duration_ms = round((time.perf_counter() - started_at) * 1000, 2)

backend/tests/test_backend_quality.py

@@ -459,6 +459,38 @@ class RequestCreationFlowTests(unittest.IsolatedAsyncioTestCase):
         self.assertIn("_csrf=secret-value", write_request.headers.get("Cookie", ""))
         self.assertIn("XSRF-TOKEN=csrf%2Etoken", write_request.headers.get("Cookie", ""))
 
+    async def test_base_request_passes_payload_to_transport_hook(self) -> None:
+        captured: dict = {}
+
+        async def send_request(
+            _client: httpx.AsyncClient,
+            method: str,
+            url: str,
+            *,
+            headers: dict,
+            params: dict | None,
+            payload: dict | None,
+        ) -> httpx.Response:
+            captured.update(
+                method=method,
+                url=url,
+                headers=headers,
+                params=params,
+                payload=payload,
+            )
+            return httpx.Response(200, request=httpx.Request(method, url), json={"ok": True})
+
+        client = requests_router.JellyseerrClient("https://seerr.test", "api-key")
+        with patch.object(client, "_send_request", new=send_request):
+            result = await client._request(
+                "POST",
+                "/api/v1/request",
+                payload={"mediaType": "movie", "mediaId": 209112},
+            )
+
+        self.assertEqual(result, {"ok": True})
+        self.assertEqual(captured["payload"], {"mediaType": "movie", "mediaId": 209112})
+
     async def test_request_destination_only_offers_live_sonarr_profiles(self) -> None:
         runtime = SimpleNamespace(
             sonarr_base_url="http://sonarr.test",