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The documentation for version 2 of the Engage API can be found here:
https://mintcdn.com/voyado/-QD3xMpfEY3BtcMt/icons/developer-link.png?fit=max&auto=format&n=-QD3xMpfEY3BtcMt&q=85&s=92be9e7202a0fc63f959e3f367cc7e32

The API v2 docs for Engage
The current version of the API is 3. That is the one recommended for all new users of Engage.