diff --git a/tap_stripe/__init__.py b/tap_stripe/__init__.py
index daa488e3..c4f75897 100755
--- a/tap_stripe/__init__.py
+++ b/tap_stripe/__init__.py
@@ -27,7 +27,7 @@
     'customers': {'sdk_object': stripe.Customer, 'key_properties': ['id']},
     'plans': {'sdk_object': stripe.Plan, 'key_properties': ['id']},
     'payment_intents': {'sdk_object': stripe.PaymentIntent, 'key_properties': ['id']},
-    'invoices': {'sdk_object': stripe.Invoice, 'key_properties': ['id']},
+    'invoices': {'sdk_object': stripe.Invoice, 'key_properties': ['id', 'billing_reason']},
     'invoice_items': {'sdk_object': stripe.InvoiceItem, 'key_properties': ['id']},
     'invoice_line_items': {'sdk_object': stripe.InvoiceLineItem,
                            'key_properties': ['id', 'invoice']},
@@ -1055,8 +1055,7 @@ def sync_event_updates(stream_name, is_sub_stream):
                                 sync_sub_stream(sub_stream_name,
                                                 event_resource_obj,
                                                 updates=True)
-            if events_obj.created > max_created:
-                max_created = events_obj.created
+            max_created = max(events_obj.created, max_created)
 
         # The events stream returns results in descending order, so we
         # cannot bookmark until the entire page is processed
diff --git a/tests/base.py b/tests/base.py
index c229dc9d..b4a6a23e 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -85,7 +85,12 @@ def expected_metadata(self):
             'customers': default,
             'plans': default,
             'payment_intents': default,
-            'invoices': default,
+            'invoices': {
+                self.AUTOMATIC_FIELDS: {"updated"},
+                self.REPLICATION_KEYS: {"created"},
+                self.PRIMARY_KEYS: {"id", "billing_reason"},
+                self.REPLICATION_METHOD: self.INCREMENTAL,
+            },
             'invoice_items': {
                 self.AUTOMATIC_FIELDS: {"updated"},
                 self.REPLICATION_KEYS: {"date"},