Hey Manoj,
The consumer still needs to authenticate themselve with valid credentials (username/Password) and have the proper Access rights to the process / object / resource.
""The username and password must be valid for Blue Prism credentials for a user with permissions log in and run a Process from Control Room. The user will also require access to run a Business Object.""
Check out the guide on Web Services, page 58 has a step by step example in it :)
BR
MaKrale