The Zapier integration is available in a private beta. Please contact us to use the Zapier integration.
Go to 'Settings -> Account'.
Enable the API. Copy the API-key.
In Zapier search for MakePlans. Add your account subdomain (youraccount.makeplans.net - youraccount is the subdomain) and paste in your API-key.
Now you can use triggers from MakePlans in Zapier and connect to thousands of other apps.