If you're on a paid plan, you can trigger Zaps from polling webhooks. In contrast to the Catch Hook trigger, which requires you to send a POST request to trigger the Zap, the Retrieve Poll trigger “polls” an endpoint for data. In other words, it allows you to send a GET request to a REST API endpoint and parse the data that is returned.
This trigger only supports basic authentication with a username and password. If you need to query an API that requires more advanced forms of authentication, you should create your own private application on the Zapier platform.