Zendesk is a cloud-based customer service platform that offers numerous tools for enhancing customer support and engagement, with the option to further extend its capabilities through integration with internal applications using its API. The process to access Zendesk's API involves logging in to an account with the necessary permissions, navigating to the admin center, and enabling token access to generate an API key. Additionally, considerations for integrating with Zendesk's API include understanding the pricing plans, which vary based on subscription length and features, as well as being aware of rate limits that differ depending on the API objects accessed. Merge's integration platform supports the management of customer integrations, offering a Unified API that simplifies the inclusion of various ticketing and project management integrations.