Mechanic maintains several official integration points:
Mechanic can be used with most HTTP APIs, via the HTTP action (for sending and receiving data) and its webhook system (for receiving pushed data). This makes it possible for developers to manually integrate many more third-party services, as long as the service in question has an appropriate API.
If you don't find a match in the task library, consider a custom task to achieve your integration. Start here: "I need something custom!"