http endpoint authentication

I am trying to get IFTTT to trigger an automation on Node-Red (installed via Hass.io) by using an http endpoint. It works when I visit the URL I’ve defined, but it asks for the http node credentials, which I have defined in the Hassio config for Node-Red but I’m not sure how to go about passing that info into ifttt? Do I need to do with with JSON in the body of the config on IFTTT?

Sorry for the noob question. I did a fair bit of googling but I couldn’t find any suitable answers. I’m probably missing something obvious.