Courier is a development platform for notifications that simplifies the process of building an effective notification system for web and mobile applications. It consolidates various communication APIs, data, and development tools in one place, allowing developers to create a best-in-class notification system that works across product features and use cases. Courier provides a powerful API, advanced send rules, consolidated notification logs, and drop-in notification inbox & preferences center, among other features. The platform enables developers to integrate with various communication providers, such as email, SMS, push notifications, and chat apps like Slack and Microsoft Teams. Courier also offers scheduling capabilities, automations, and analytics to streamline the notification workflow. By using Python and Courier, developers can create an automated notification system that sends real-time updates to users, streamlines communication within organizations, and elevates the user experience for customers.