The key points of the text can be summarized in a neutral and interesting paragraph as follows: Implementing SMS and MMS marketing notifications involves creating a subscriber model to track users who opt-in to receive updates, handling incoming messages from Twilio webhook requests, and sending messages to all subscribers via the Twilio API. The application uses Node.js and Express to handle form submissions, authenticate with Twilio, and send messages to subscribers. A static function on the Subscriber model sends messages to all active subscribers based on parameters sent in from the controller. The application also includes a route for administrators to craft campaign messages, a function to process incoming message commands, and logic to manage user subscriptions. With this implementation, an administrator can use a web form to send MMS notifications to subscribers, while users can opt-in or opt-out of receiving updates via SMS or MMS.