diff --git a/http-api/cognito.py b/http-api/cognito.py
index 485bf6d..839dfba 100644
--- a/http-api/cognito.py
+++ b/http-api/cognito.py
@@ -1,4 +1,4 @@
-class UserNotFound(Exception): ...
+class UnauthorizedError(Exception): ...
 
 
 def get_user(access_token: str, *, idp_client) -> dict | None:
@@ -6,6 +6,6 @@ def get_user(access_token: str, *, idp_client) -> dict | None:
     try:
         user = idp_client.get_user(AccessToken=access_token)
     except idp_client.exceptions.ClientError:
-        raise UserNotFound()
+        raise UnauthorizedError()
     else:
         return {attr['Name']: attr['Value'] for attr in user['UserAttributes']}
diff --git a/http-api/middlewares.py b/http-api/middlewares.py
index dd03d1a..fcdcb7a 100644
--- a/http-api/middlewares.py
+++ b/http-api/middlewares.py
@@ -1,5 +1,3 @@
-import json
-
 from aws_lambda_powertools.event_handler.api_gateway import (
     APIGatewayHttpResolver,
     Response,
@@ -8,7 +6,9 @@ from aws_lambda_powertools.event_handler.middlewares import (
     BaseMiddlewareHandler,
     NextMiddleware,
 )
-from aws_lambda_powertools.shared.json_encoder import Encoder
+from aws_lambda_powertools.shared.functions import (
+    extract_event_from_common_models,
+)
 from layercake.dateutils import now, ttl
 from layercake.dynamodb import ComposeKey, DynamoDBCollection, KeyPair
 from pydantic import UUID4, BaseModel, Field
@@ -16,6 +16,14 @@ from pydantic import UUID4, BaseModel, Field
 LOG_RETENTION_DAYS = 365 * 2  # 2 years
 
 
+class AuthenticatedUser(BaseModel):
+    id: str = Field(alias='custom:user_id')
+    name: str
+    email: str
+    email_verified: bool
+    sub: UUID4
+
+
 class AuthorizerMiddleware(BaseMiddlewareHandler):
     def handler(
         self,
@@ -33,14 +41,6 @@ class AuthorizerMiddleware(BaseMiddlewareHandler):
         return next_middleware(app)
 
 
-class AuthenticatedUser(BaseModel):
-    id: str = Field(alias='custom:user_id')
-    name: str
-    email: str
-    email_verified: bool
-    sub: UUID4
-
-
 class AuditLogMiddleware(BaseMiddlewareHandler):
     """This middleware logs audit details for successful requests, storing user,
     action, and IP info with a specified retention period.."""
@@ -71,7 +71,9 @@ class AuditLogMiddleware(BaseMiddlewareHandler):
         if 200 <= response.status_code < 300 and user:
             now_ = now()
             data = (
-                json.dumps(response.body, cls=Encoder) if response.is_json() else None
+                extract_event_from_common_models(response.body)
+                if response.is_json()
+                else None
             )
             retention_days = (
                 ttl(start_dt=now_, days=self.retention_days)
diff --git a/http-api/routes/courses/__init__.py b/http-api/routes/courses/__init__.py
index 6c0f3b6..894e01a 100644
--- a/http-api/routes/courses/__init__.py
+++ b/http-api/routes/courses/__init__.py
@@ -53,7 +53,7 @@ def post_course(payload: Course):
     )
 
     return Response(
-        body={'id': str(payload.id), },
+        body=payload,
         content_type=content_types.APPLICATION_JSON,
         status_code=HTTPStatus.CREATED,
     )
diff --git a/http-api/routes/users/__init__.py b/http-api/routes/users/__init__.py
index 1147b8e..7a994ee 100644
--- a/http-api/routes/users/__init__.py
+++ b/http-api/routes/users/__init__.py
@@ -23,6 +23,7 @@ from pydantic import UUID4, BaseModel, StringConstraints
 
 import elastic
 from boto3clients import dynamodb_client
+from middlewares import AuditLogMiddleware
 from models import User
 from settings import ELASTIC_CONN, USER_TABLE
 
@@ -32,7 +33,7 @@ class BadRequestError(MissingError, PowertoolsBadRequestError): ...
 
 router = Router()
 user_layer = DynamoDBPersistenceLayer(USER_TABLE, dynamodb_client)
-collect = DynamoDBCollection(user_layer, exc_cls=BadRequestError)
+collect = DynamoDBCollection(user_layer, exception_cls=BadRequestError)
 elastic_client = Elasticsearch(**ELASTIC_CONN)
 
 
@@ -60,6 +61,7 @@ def get_users():
     compress=True,
     tags=['User'],
     summary='Create user',
+    middlewares=[AuditLogMiddleware('USER_ADD', collect)],
 )
 def post_user(payload: User):
     return Response(status_code=HTTPStatus.CREATED)
diff --git a/http-api/template.yaml b/http-api/template.yaml
index 87ca981..df019e1 100644
--- a/http-api/template.yaml
+++ b/http-api/template.yaml
@@ -23,7 +23,7 @@ Globals:
     Architectures:
       - x86_64
     Layers:
-      - !Sub arn:aws:lambda:sa-east-1:336641857101:layer:layercake:25
+      - !Sub arn:aws:lambda:sa-east-1:336641857101:layer:layercake:26
     Environment:
       Variables:
         TZ: America/Sao_Paulo
diff --git a/http-api/tests/conftest.py b/http-api/tests/conftest.py
index ba69cbe..09ece6f 100644
--- a/http-api/tests/conftest.py
+++ b/http-api/tests/conftest.py
@@ -13,6 +13,11 @@ PK = os.getenv('DYNAMODB_PARTITION_KEY', 'pk')
 SK = os.getenv('DYNAMODB_SORT_KEY', 'sk')
 
 
+patch = pytest.MonkeyPatch()
+patch.setenv('USER_TABLE', PYTEST_TABLE_NAME)
+patch.setenv('COURSE_TABLE', PYTEST_TABLE_NAME)
+
+
 @dataclass
 class LambdaContext:
     function_name: str = 'test'
@@ -137,9 +142,6 @@ def dynamodb_seeds(dynamodb_client):
 
 @pytest.fixture
 def mock_app(monkeypatch):
-    for table_name in ['USER_TABLE', 'COURSE_TABLE']:
-        monkeypatch.setenv(table_name, PYTEST_TABLE_NAME)
-
     import app
 
     return app
diff --git a/http-api/tests/routes/test_users.py b/http-api/tests/routes/test_users.py
index b93e1f8..dfdb4d6 100644
--- a/http-api/tests/routes/test_users.py
+++ b/http-api/tests/routes/test_users.py
@@ -87,6 +87,7 @@ def test_get_logs(
 
 def test_post_user(
     mock_app,
+    dynamodb_client,
     http_api_proxy: HttpApiProxy,
     lambda_context: LambdaContext,
 ):
diff --git a/http-api/tests/test_auth.py b/http-api/tests/test_auth.py
index 7b9b545..8cea1b3 100644
--- a/http-api/tests/test_auth.py
+++ b/http-api/tests/test_auth.py
@@ -5,6 +5,8 @@ from .conftest import LambdaContext
 
 
 def test_bearer_jwt(lambda_context: LambdaContext):
+    import auth as app
+
     # You should mock the Cognito user to pass the test
     app.get_user = lambda *args, **kwargs: {
         'sub': '58efed8d-d276-41a8-8502-4ab8b5a6415e',
@@ -30,6 +32,7 @@ def test_bearer_jwt(lambda_context: LambdaContext):
 
 
 def test_bearer_apikey(
+    monkeypatch,
     dynamodb_seeds,
     lambda_context: LambdaContext,
 ):
@@ -38,6 +41,7 @@ def test_bearer_apikey(
             'authorization': 'Bearer sk-MzI1MDQ0NTctZjEzMy00YzAwLTkzNmItNmFhNzEyY2E5ZjQw',
         }
     }
+
     # This data was added from seeds
     assert app.lambda_handler(event, lambda_context) == {
         'isAuthorized': True,
@@ -49,7 +53,7 @@ def test_bearer_apikey(
         },
     }
 
-    # This data was added from seeds
+    # # This data was added from seeds
     assert app.lambda_handler(
         {
             'headers': {
diff --git a/http-api/uv.lock b/http-api/uv.lock
index 9464757..852df5b 100644
--- a/http-api/uv.lock
+++ b/http-api/uv.lock
@@ -444,7 +444,7 @@ wheels = [
 
 [[package]]
 name = "layercake"
-version = "0.1.8"
+version = "0.1.9"
 source = { directory = "../layercake" }
 dependencies = [
     { name = "aws-lambda-powertools", extra = ["all"] },
diff --git a/layercake/layercake/dynamodb.py b/layercake/layercake/dynamodb.py
index 190ad00..3adb3ff 100644
--- a/layercake/layercake/dynamodb.py
+++ b/layercake/layercake/dynamodb.py
@@ -27,30 +27,31 @@ serializer = TypeSerializer()
 deserializer = TypeDeserializer()
 
 
-def _serialize_python_type(value: Any) -> str | dict | list:
-    match value:
+def _serialize_to_primitive_types(data: Any) -> str | dict | list:
+    match data:
         case datetime():
-            return value.isoformat()
+            return data.isoformat()
         case UUID():
-            return str(value)
+            return str(data)
         case IPv4Address():
-            return str(value)
+            return str(data)
         case list() | tuple():
-            return [_serialize_python_type(v) for v in value]
+            return [_serialize_to_primitive_types(v) for v in data]
         case dict():
-            return {k: _serialize_python_type(v) for k, v in value.items()}
+            return {k: _serialize_to_primitive_types(v) for k, v in data.items()}
         case _:
-            return value
+            return data
 
 
-def serialize(value: dict) -> dict:
+def serialize(data: dict) -> dict:
     return {
-        k: serializer.serialize(_serialize_python_type(v)) for k, v in value.items()
+        k: serializer.serialize(_serialize_to_primitive_types(v))
+        for k, v in data.items()
     }
 
 
-def deserialize(value: dict) -> dict:
-    return {k: deserializer.deserialize(v) for k, v in value.items()}
+def deserialize(data: dict) -> dict:
+    return {k: deserializer.deserialize(v) for k, v in data.items()}
 
 
 if TYPE_CHECKING:
@@ -555,16 +556,16 @@ class DynamoDBCollection:
         self,
         persistence_layer: DynamoDBPersistenceLayer,
         /,
-        exc_cls: Type[ValueError] = MissingError,
+        exception_cls: Type[ValueError] = MissingError,
         tz: str = TZ,
     ) -> None:
-        if not issubclass(exc_cls, ValueError):
+        if not issubclass(exception_cls, ValueError):
             raise TypeError(
-                f'exception_cls must be a subclass of ValueError, got {exc_cls}'
+                f'exception_cls must be a subclass of ValueError, got {exception_cls}'
             )
 
         self.persistence_layer = persistence_layer
-        self.exc_cls = exc_cls
+        self.exception_cls = exception_cls
         self.tz = tz
 
     def get_item(
@@ -575,7 +576,7 @@ class DynamoDBCollection:
         default: Any = None,
         delimiter: str = '#',
     ) -> Any:
-        exc_cls = self.exc_cls
+        exc_cls = self.exception_cls
         data = self.persistence_layer.get_item(key)
 
         if raise_on_error and not data:
diff --git a/layercake/pyproject.toml b/layercake/pyproject.toml
index 5aa5698..231e963 100644
--- a/layercake/pyproject.toml
+++ b/layercake/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "layercake"
-version = "0.1.8"
+version = "0.1.9"
 description = "Add your description here"
 readme = "README.md"
 authors = [
diff --git a/layercake/uv.lock b/layercake/uv.lock
index 83d1ac1..cbcf934 100644
--- a/layercake/uv.lock
+++ b/layercake/uv.lock
@@ -465,7 +465,7 @@ wheels = [
 
 [[package]]
 name = "layercake"
-version = "0.1.6"
+version = "0.1.9"
 source = { editable = "." }
 dependencies = [
     { name = "aws-lambda-powertools", extra = ["all"] },