Fix Ecomail newsletter tag updates

shared/utils.py

@@ -72,11 +72,11 @@ def subscribe_to_newsletter(email, list_id):
 
 def subscribe_to_ecomail_newsletter(
     email: str,
-    categories: str,
+    tags: str,
     source: str,
     list_id: int | None = None,
     custom_data: dict | None = None,
-    update_existing: bool = True
+    update_existing: bool = True,
 ):
     if custom_data is None:
         custom_data = {}
@@ -84,13 +84,25 @@ def subscribe_to_ecomail_newsletter(
     if not list_id:
         list_id = settings.ECOMAIL_DEFAULT_LIST_ID
 
-    split_categories = categories.split(",") if categories is not None else []
+    existing_subscriber_data = requests.get(
+        urljoin(settings.ECOMAIL_API_URL, f"lists/{list_id}/subscriber/{email}"),
+        headers={"key": settings.ECOMAIL_API_KEY},
+    )
+
+    existing_tags = []
+
+    if existing_subscriber_data.status_code == 200:
+        existing_subscriber_data = existing_subscriber_data.json()
+        existing_tags = existing_subscriber_data["subscriber"]["tags"]
+
+    split_tags = tags.split(",") if tags is not None else []
+    split_tags += existing_tags
 
     data = {
         "subscriber_data": {
             "email": email,
             "source": source,
-            "tags": split_categories,
+            "tags": split_tags,
             **custom_data,
         },
         "update_existing": update_existing,