Far as a tie into Integromat you are likely talking about using the HTTP module to act as an in-between proxy for WordPress to knack here is an SSO/Oauth tutorial using Intergomat to deviant art.
Yes you can use the built in SSO to Knack it's not obvious how to get to. Goto a page within your project that you have password protected then click on settings then options and you will see the SSO settings