diff --git a/feed_chat_webhook/__main__.py b/feed_chat_webhook/__main__.py
index 6b58081..faa9ac6 100644
--- a/feed_chat_webhook/__main__.py
+++ b/feed_chat_webhook/__main__.py
@@ -1,21 +1,51 @@
-from json import dumps
 import requests
-import secrets_loader
+import secret_loader
+import feedparser
+from markdownify import markdownify
 
-secrets = secrets_loader.SecretsLoader()
+SESSION = requests.Session()
 
+secrets = secret_loader.SecretLoader()
 WEBHOOK_URL = secrets.load_or_fail('WEBHOOK_URL')
+FEED_URL = secrets.load_or_fail('FEED_URL')
 
-def main():
-    """Google Chat incoming webhook quickstart."""
-    app_message = {"text": "Hello from a Python script!"}
+def send_feed_notice(text: str):
+    app_message = {"text": text}
     message_headers = {"Content-Type": "application/json; charset=UTF-8"}
     response = requests.post(
         WEBHOOK_URL,
         headers=message_headers,
         json=app_message,
     )
-    print(response)
+
+def get_feed():
+    response = SESSION.get(FEED_URL)
+    return feedparser.parse(response.text)
+
+def get_seen_entry_ids() -> set[str]:
+    with open('output/entries_db.txt') as f:
+        return f.read().split('\n')
+
+def mark_as_sent(entry_id: str):
+    with open('output/entries_db.txt', 'a') as f:
+        f.write(entry_id)
+        f.write('\n')
+
+
+def check_for_new_updates():
+    seen_entries = get_seen_entry_ids()
+    feed = get_feed()
+    for entry in reversed(feed.entries):
+        if entry.id in seen_entries:
+            continue
+
+        msg = f'Feed <{feed.feed.link}|{feed.feed.title}> updated: <{entry.link}|{entry.title}>'
+        send_feed_notice(msg)
+        mark_as_sent(entry.id)
+
+
+def main():
+    check_for_new_updates()
 
 if __name__ == '__main__':
     main()