Situation:- To execute the process flow using the HTTP Post URL and to fetch the data (like any file or XML data) from this HTTP or Rest URL.
Solution:- You need to invoke below URL to execute the process flow through HTTP call:-
Also, when you are using the URL with any of the REST client (postman, SOAPUI) then you can use the POST method and in the body of that method, you can copy the data which you need to fetch in the process flow.
All the data which you have defined in the body of POST method will be reflected in the variable 'restRequestInput' of the process flow. You can utilize this variable as per your requirement in the process flow.