diff --git a/mindee/mindee_http/mindee_api_v2.py b/mindee/mindee_http/mindee_api_v2.py
index 03202f29..940836c4 100644
--- a/mindee/mindee_http/mindee_api_v2.py
+++ b/mindee/mindee_http/mindee_api_v2.py
@@ -79,7 +79,7 @@ def req_post_inference_enqueue(
         :param params: Options for the enqueueing of the document.
         :return: requests response.
         """
-        data = {"model_id": params.model_id}
+        data: Dict[str, Union[str, list]] = {"model_id": params.model_id}
         url = f"{self.url_root}/inferences/enqueue"
 
         if params.rag is not None:
@@ -91,7 +91,7 @@ def req_post_inference_enqueue(
         if params.polygon is not None:
             data["polygon"] = str(params.polygon).lower()
         if params.webhook_ids and len(params.webhook_ids) > 0:
-            data["webhook_ids"] = ",".join(params.webhook_ids)
+            data["webhook_ids"] = params.webhook_ids
         if params.alias and len(params.alias):
             data["alias"] = params.alias
 
diff --git a/mindee/parsing/v2/field/field_location.py b/mindee/parsing/v2/field/field_location.py
index 74b20a96..caf5677b 100644
--- a/mindee/parsing/v2/field/field_location.py
+++ b/mindee/parsing/v2/field/field_location.py
@@ -10,7 +10,7 @@ class FieldLocation:
 
     def __init__(self, server_response: StringDict) -> None:
         """
-        Initialize FieldLocation from server response.
+        Initialize FieldLocation from the server response.
 
         :param server_response: Raw server response.
         """
diff --git a/tests/test_client_v2_integration.py b/tests/test_client_v2_integration.py
index 746b85c1..b88c1d72 100644
--- a/tests/test_client_v2_integration.py
+++ b/tests/test_client_v2_integration.py
@@ -157,11 +157,11 @@ def test_parse_file_filled_single_page_must_succeed(
 
 @pytest.mark.integration
 @pytest.mark.v2
-def test_invalid_uuid_must_throw_error_422(v2_client: ClientV2) -> None:
+def test_invalid_uuid_must_throw_error(v2_client: ClientV2) -> None:
     """
     Using an invalid model identifier must trigger a 422 HTTP error.
     """
-    input_path: Path = FILE_TYPES_DIR / "pdf" / "multipage_cut-2.pdf"
+    input_path: Path = FILE_TYPES_DIR / "pdf" / "blank_1.pdf"
 
     input_source = PathInput(input_path)
     params = InferenceParameters(model_id="INVALID MODEL ID")
@@ -173,6 +173,55 @@ def test_invalid_uuid_must_throw_error_422(v2_client: ClientV2) -> None:
     assert exc.status == 422
 
 
+@pytest.mark.integration
+@pytest.mark.v2
+def test_unknown_model_must_throw_error(v2_client: ClientV2) -> None:
+    """
+    Using an unknown model identifier must trigger a 404 HTTP error.
+    """
+    input_path: Path = FILE_TYPES_DIR / "pdf" / "blank_1.pdf"
+
+    input_source = PathInput(input_path)
+    params = InferenceParameters(model_id="fc405e37-4ba4-4d03-aeba-533a8d1f0f21")
+
+    with pytest.raises(MindeeHTTPErrorV2) as exc_info:
+        v2_client.enqueue_inference(input_source, params)
+
+    exc: MindeeHTTPErrorV2 = exc_info.value
+    assert exc.status == 404
+
+
+@pytest.mark.integration
+@pytest.mark.v2
+def test_unknown_webhook_ids_must_throw_error(
+    v2_client: ClientV2, findoc_model_id: str
+) -> None:
+    """
+    Using an unknown webhook identifier must trigger an error.
+    """
+    input_path: Path = FILE_TYPES_DIR / "pdf" / "blank_1.pdf"
+
+    input_source = PathInput(input_path)
+    params = InferenceParameters(
+        model_id=findoc_model_id,
+        webhook_ids=[
+            "fc405e37-4ba4-4d03-aeba-533a8d1f0f21",
+            "fc405e37-4ba4-4d03-aeba-533a8d1f0f21",
+        ],
+        rag=None,
+        raw_text=None,
+        polygon=None,
+        confidence=None,
+    )
+
+    with pytest.raises(MindeeHTTPErrorV2) as exc_info:
+        v2_client.enqueue_inference(input_source, params)
+
+    exc: MindeeHTTPErrorV2 = exc_info.value
+    assert exc.status == 422
+    assert "no matching webhooks" in exc.detail.lower()
+
+
 @pytest.mark.integration
 @pytest.mark.v2
 def test_url_input_source_must_not_raise_errors(