diff --git a/api/main.py b/api/main.py
index 543bcac..db3050f 100644
--- a/api/main.py
+++ b/api/main.py
@@ -236,7 +236,7 @@ async def app_startup(**kwargs):
         oauth_json = script_cred["google"]["oauth"]["tcaoff"],
         http_client = current_app.http_client,
         redirect_url = r"https://api.thecaoffice.com/converse/mail/callback/gmail",
-        debug = True,
+        debug = enable_debugging,
         debug_prefix = "GMail (M) | ",
         debug_only_errors = False
     )
diff --git a/models/behaviour/mail/sync.py b/models/behaviour/mail/sync.py
new file mode 100644
index 0000000..febdce5
--- /dev/null
+++ b/models/behaviour/mail/sync.py
@@ -0,0 +1,199 @@
+"""
+
+    AUTHOR:
+
+        Khushal P Soonderji
+
+    DATE:
+
+        Wednesday, 27th Nov., 2024
+
+    OBJECTIVE:
+
+        Here we perform on-time mail syncing activities for our users.
+
+    REFERENCES:
+
+        N/A
+
+    DOWNLOADS:
+
+        N/A
+
+"""
+
+#   *****************************************************************************************************************
+#  *****                                                                                                          ****
+# ***                                                   IMPORT                                                      ***
+#  *****                                                                                                          ****
+#   *****************************************************************************************************************
+
+
+# To make sibling directories accessible for imports:
+import sys
+sys.path.append(".")
+sys.path.append("..")
+
+# My async utils:
+from utils_v2.string import json
+from utils_v2.date_time import date_time
+from utils_v2.database.async_mongo_v2 import AsyncMongo
+
+# To work with MongoDB:
+from bson import ObjectId
+
+# To work with datatypes:
+from typing import Literal
+
+# To make deep-copies:
+import copy
+
+
+#   *****************************************************************************************************************
+#  *****                                                                                                          ****
+# ***                                           MACROS / ONE-TIME INIT                                              ***
+#  *****                                                                                                          ****
+#   *****************************************************************************************************************
+
+
+# --- Nothing Yet
+
+
+#   *****************************************************************************************************************
+#  *****                                                                                                          ****
+# ***                                                VARIABLES                                                      ***
+#  *****                                                                                                          ****
+#   *****************************************************************************************************************
+
+
+# --- Nothing Yet
+
+
+#   *****************************************************************************************************************
+#  *****                                                                                                          ****
+# ***                                                  FUNCTIONS                                                    ***
+#  *****                                                                                                          ****
+#   *****************************************************************************************************************
+
+
+# --- Nothing Yet
+
+
+#   *****************************************************************************************************************
+#  *****                                                                                                          ****
+# ***                                                   CLASSES                                                     ***
+#  *****                                                                                                          ****
+#   *****************************************************************************************************************
+
+
+class MailOAuthModel:
+
+    AUTH_COLLECTION = "_authTokens"
+
+    def __init__(self):
+        pass
+
+    @staticmethod
+    async def get_id(
+            db_conn: AsyncMongo,
+            user_info: dict,
+            service_type: Literal["email", "chat"],
+            service_client: Literal["gmail"],
+            auth_type: Literal["oauth"]
+    ) -> ObjectId:
+
+        """
+        Stores params from the session info and gives an identifier to use in the authorization URL. Use this when the
+        user requests an authorization URL to link your service to another service (like GMail).
+        :param db_conn: The database connection to use to perform the action.
+        :param user_info: The dictionary that has the user's session information.
+        :param service_type: The type of service being provided.
+        :param service_client: The name of the company or brand that is providing this service that is being integrated.
+        :param auth_type: To identify the type of authentication being done here. This could indicate simple password
+            authentication, more advance OAuth2.0 authentication, etc.
+        :return: An ObjectId to later store the granted tokens.
+        """
+
+        # Note down the timestamp at which this event occurred:
+        request_ts = date_time.get_current_utc_date_time(as_string = False)
+
+        # Get the identifier from the database:
+        db_json = await db_conn.find_one_and_update(
+            collection = MailOAuthModel.AUTH_COLLECTION,
+            filter = {
+                "serviceType": service_type,
+                "client": service_client,
+                "authType": auth_type,
+                "user": user_info,
+            },
+            update = {
+                "$set": {
+                    "lastRequestTs": request_ts
+                },
+                "$setOnInsert": {
+                    "version": "1.0.0",
+                    "serviceType": service_type,
+                    "client": service_client,
+                    "authType": auth_type,
+                    "user": user_info,
+                    "token": None,
+                    "firstRefreshTs": None,
+                    "lastRefreshTs": None,
+                    "firstRequestTs": request_ts,
+                }
+            },
+            projection = {
+                "_id": True
+            },
+            upsert = True,
+            return_updated = True
+        )
+
+        # Done here:
+        return db_json["_id"] if db_json else None
+
+    @staticmethod
+    async def set_token(
+            db_conn: AsyncMongo,
+            user_identifier: ObjectId | str,
+            token: dict
+    ) -> bool:
+
+        """
+        This method is to be called when the end user authorizes your service to connect to his third-party account. For
+        example, when the end user allows you to access his GMail account.
+        :param db_conn: The database connection to use to perform the action.
+        :param user_identifier: The identifier granted by the 'get_id' method.
+        :param token: The token granted by the third-party service.
+        :return:
+        """
+
+        # Note down the timestamp at which this event occurred:
+        request_ts = date_time.get_current_utc_date_time(as_string = False)
+
+        # Save the token to the database:
+        token_saved = await db_conn.update_one(
+            collection = MailOAuthModel.AUTH_COLLECTION,
+            filter = {"_id": ObjectId(user_identifier)},
+            update = {
+                "$set": {
+                    "token": token,
+                    "firstRefreshTs": request_ts,
+                }
+            }
+        )
+
+        # Done here:
+        return token_saved
+
+
+#   *****************************************************************************************************************
+#  *****                                                                                                          ****
+# ***                                               MAIN PROGRAM                                                    ***
+#  *****                                                                                                          ****
+#   *****************************************************************************************************************
+
+
+if __name__ == "__main__":
+
+    pass