Automatically update existing subscribers in ecomail API

shared/utils.py

@@ -76,6 +76,7 @@ def subscribe_to_ecomail_newsletter(
     source: str,
     list_id: int | None = None,
     custom_data: dict | None = None,
+    update_existing: bool = True
 ):
     if custom_data is None:
         custom_data = {}
@@ -91,7 +92,8 @@ def subscribe_to_ecomail_newsletter(
             "source": source,
             "tags": split_categories,
             **custom_data,
-        }
+        },
+        "update_existing": update_existing,
     }
 
     response = requests.post(