This REST API is designed for developers and system administrators who need to connect external applications, like CRMs or custom software, to a newsletter management system. It enables automated, server-to-server operations for subscriber data, list management, and newsletter archives.

• Subscriber Management: Use POST, PUT, and DELETE methods to add, update, or remove subscribers. This allows for syncing user data from external databases or customer platforms.
• List Control: Programmatically add or remove subscribers from specific mailing lists. This feature supports triggering automated email series based on external user actions.
• Public Subscription Endpoint: A dedicated endpoint allows public clients, like mobile apps, to initiate the standard subscription process, including spam checks and welcome emails.
• Data Retrieval: Fetch configured subscription lists and an archive of sent newsletters. This enables building external dashboards or public newsletter archives.
• Webhook Support: An action hook is triggered when a subscriber is created or updated via the API, allowing for custom follow-up logic or data logging in connected systems.