diff --git a/.github/workflows/sdk-compliance.yml b/.github/workflows/sdk-compliance.yml
index 99a214ed..22853555 100644
--- a/.github/workflows/sdk-compliance.yml
+++ b/.github/workflows/sdk-compliance.yml
@@ -14,8 +14,8 @@ on:
 jobs:
   compliance:
     name: PostHog SDK compliance tests
-    uses: PostHog/posthog-sdk-test-harness/.github/workflows/test-sdk-action.yml@85e2901ea3260a28e07a83086d59b4fb4dfc814f
+    uses: PostHog/posthog-sdk-test-harness/.github/workflows/test-sdk-action.yml@be8b8d5a3f94a249659844e94832e874f049c1e4
     with:
       adapter-dockerfile: "sdk_compliance_adapter/Dockerfile"
       adapter-context: "."
-      test-harness-version: "main-85e2901@sha256:4c8eac34e7ff66554a2c6947788c0a42b82456bc949c03bd8f6b9a10bef23ef5"
+      test-harness-version: "0.8.0"
diff --git a/posthog/request.py b/posthog/request.py
index de16f33a..a233dede 100644
--- a/posthog/request.py
+++ b/posthog/request.py
@@ -227,6 +227,7 @@ def post(
     gzip: bool = False,
     timeout: int = 15,
     session: Optional[requests.Session] = None,
+    api_key_field: str = "api_key",
     **kwargs,
 ) -> requests.Response:
     """Post the `kwargs` to the API"""
@@ -235,7 +236,7 @@ def post(
     body["sent_at"] = datetime.now(tz=timezone.utc).isoformat()
     trimmed_host = remove_trailing_slash(normalize_host(host))
     url = trimmed_host + cast(str, path)
-    body["api_key"] = api_key
+    body[api_key_field] = api_key
     data: str | bytes = json.dumps(body, cls=DatetimeSerializer)
     log.debug("making request: %s to url: %s", data, url)
     headers = {"Content-Type": "application/json", "User-Agent": USER_AGENT}
@@ -321,6 +322,7 @@ def flags(
         gzip,
         timeout,
         session=_get_flags_session(),
+        api_key_field="token",
         **kwargs,
     )
     return _process_response(
diff --git a/posthog/test/test_request.py b/posthog/test/test_request.py
index 4cae68f9..ffedd8a9 100644
--- a/posthog/test/test_request.py
+++ b/posthog/test/test_request.py
@@ -85,6 +85,18 @@ def test_post_sends_snake_case_sent_at(key, expected_present):
     assert (key in data) is expected_present
 
 
+def test_flags_request_uses_token_field_for_project_api_key():
+    mock_response = mock.MagicMock()
+    mock_response.status_code = 200
+    mock_response.json.return_value = {"featureFlags": {}}
+
+    with mock.patch.object(request_module, "post", return_value=mock_response) as mock_post:
+        flags(TEST_API_KEY, host="https://test.posthog.com", distinct_id="user_1")
+
+    mock_post.assert_called_once()
+    assert mock_post.call_args.kwargs["api_key_field"] == "token"
+
+
 def test_message_only_debug_logs_include_posthog_prefix():
     mock_response = requests.Response()
     mock_response.status_code = 200
diff --git a/sdk_compliance_adapter/CONTRIBUTING.md b/sdk_compliance_adapter/CONTRIBUTING.md
index f6ef9ef3..25bcb424 100644
--- a/sdk_compliance_adapter/CONTRIBUTING.md
+++ b/sdk_compliance_adapter/CONTRIBUTING.md
@@ -35,7 +35,7 @@ docker run -d --name sdk-adapter --network test-network -p 8080:8080 posthog-pyt
 docker run --rm \
   --name test-harness \
   --network test-network \
-  ghcr.io/posthog/sdk-test-harness:latest \
+  ghcr.io/posthog/sdk-test-harness:0.8.0 \
   run --adapter-url http://sdk-adapter:8080 --mock-url http://test-harness:8081
 
 # Cleanup
diff --git a/sdk_compliance_adapter/adapter.py b/sdk_compliance_adapter/adapter.py
index 032dea68..88dbb691 100644
--- a/sdk_compliance_adapter/adapter.py
+++ b/sdk_compliance_adapter/adapter.py
@@ -20,7 +20,7 @@
 
 # Configure logging
 logging.basicConfig(
-    level=logging.DEBUG, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+    level=logging.WARNING, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
 )
 logger = logging.getLogger(__name__)
 
@@ -225,7 +225,7 @@ def init():
         api_key = data.get("api_key")
         host = data.get("host")
         flush_at = data.get("flush_at", 100)
-        flush_interval_ms = data.get("flush_interval_ms", 5000)
+        flush_interval_ms = data.get("flush_interval_ms", 500)
         max_retries = data.get("max_retries", 3)
         enable_compression = data.get("enable_compression", False)
 
@@ -245,7 +245,7 @@ def init():
             flush_interval=flush_interval,
             gzip=enable_compression,
             max_retries=max_retries,
-            debug=True,
+            debug=False,
             # Compliance tests assert the request-level default when callers omit
             # disable_geoip. Configure the adapter to exercise geoip-enabled
             # /flags requests by default while still allowing per-call overrides.
diff --git a/sdk_compliance_adapter/docker-compose.yml b/sdk_compliance_adapter/docker-compose.yml
index 138bf4a8..bace8849 100644
--- a/sdk_compliance_adapter/docker-compose.yml
+++ b/sdk_compliance_adapter/docker-compose.yml
@@ -13,7 +13,7 @@ services:
 
   # Test harness
   test-harness:
-    image: ghcr.io/posthog/sdk-test-harness:latest
+    image: ghcr.io/posthog/sdk-test-harness:0.8.0
     command: ["run", "--adapter-url", "http://sdk-adapter:8080", "--mock-url", "http://test-harness:8081"]
     networks:
       - test-network