I had already done the steps you mentioned above. What I want to do is send a parameter to the URL. Let me share an example. I have a requirement where I need to send orderno and mobile no when the order creation event is triggered like -
The Order record is passed as a JSON document to the url. What I need is just the orderno and mobile number to be selectively passed to url. The URL is an existing third party API, that I cannot change, it expects these two parameters to be sent for the API to trigger the correct fucntion.