diff --git a/csp_billing_adapter_amazon/plugin.py b/csp_billing_adapter_amazon/plugin.py
index 983fb62..2292c8e 100644
--- a/csp_billing_adapter_amazon/plugin.py
+++ b/csp_billing_adapter_amazon/plugin.py
@@ -48,6 +48,8 @@ def meter_billing(
     config: Config,
     dimensions: dict,
     timestamp: datetime,
+    billing_period_start: str,
+    billing_period_end: str,
     dry_run: bool
 ):
     """
diff --git a/tests/unit/test_plugin.py b/tests/unit/test_plugin.py
index 25b0d60..87e5521 100644
--- a/tests/unit/test_plugin.py
+++ b/tests/unit/test_plugin.py
@@ -51,6 +51,8 @@ def test_meter_billing(mock_boto3, mock_get_region):
         config,
         dimensions,
         timestamp,
+        '2024-10-02T17:58:09.985794+00:00',
+        '2024-10-02T17:58:09.985794+00:00',
         dry_run=True
     )
 
@@ -74,6 +76,8 @@ def test_meter_billing_error(mock_boto3, mock_get_region):
         config,
         dimensions,
         timestamp,
+        '2024-10-02T17:58:09.985794+00:00',
+        '2024-10-02T17:58:09.985794+00:00',
         dry_run=True
     )