After creation a web Hook, How can I consume that web hook via postman

how to trigger created request URL???

hook events are defined for every model(Doctype). if you have defined hook it will automatically trigger once you create any document from web or calling external API to create that document.
if you have written RPC method to invoke that method on local localhoat:8000/api/method/app.{path}

Thanks for the reply. Now I’m getting this error.

you have taken as it is if i am running my bench on 8000 and my method is in-app itself then it would be like