The document discusses an API provided by Campaign Commander that allows integration with third party applications. The API has several functional domains including message management, data synchronization, segmentation, campaign management, notification services, and reporting. It provides examples of how Renault uses the API to power a customer portal called "My Renault" and how Mercedes-Benz uses it for campaign creation, sending messages, and reports. The API aims to accelerate partnerships and integrations while providing a robust API platform.