Are there any webhook examples for Retool workflows?

Hi, I am trying to create a Retool workflow that is triggered when a Stripe payment link is paid. I have been using this link as reference (Stripe's webhook info page):
Use incoming webhooks to get real-time updates | Stripe Documentation

I have never dealt with webhooks before, and I am really confused on what to put in the trigger block. Do I need to create a URL elsewhere first similar to a redirect URL for this to work? Do I edit the example CURL line of the trigger block? (it does not seem like it can be edited). What goes in the JSON body?

I realize some of these questions may be very basic programming questions which is why I am hoping to find an example that is already built.
I have been looking for any examples of Webhook triggers for Retool workflows, but it seems all of the examples are chron triggers.