The Perfex to SaaS module can be interacted with through API.
The API is documentation (Open API Specification 3 – OAS3) is inclusive and can be configured directly from your SaaS settings page (API tab).

Enabling ‘Allow public access to API Documentation’ will allow your API Specification publicly accessible, otherwise can only be accessible when logged in as admin.
After enabling the API, you can find SaaS > API menu from where you can find link to your Open API Specification in varying format and manage API User tokens.

Some utility endpoints are open and does not requires API key, such endpoint include the health check, caddy domain check, slug availability and custom domain check. Other requires valid secure API key to access.
See below image for creating API key and managing the the accessible endpoint by the User. You can create multiple API Users.

Click here to read more: https://perfextosaas.com/saas/api/docs