Option 1:- Exposing Web Service Using Blue Prism. Please check the following Steps:
1)	Create the Proxy class using command line and paste those code in Business Properties Global Code.
2)	Go to  Initialization page  Business Properties  Code Options Import .dll using System.Net;
3)	Take a new Code Box In Initialization Page  Code Tab   Apply Following Code as below e.g.
CalculatorService mWebService = new CalculatorService(Url)
 NetworkCredential  myCredentials = new NetworkCredential(""admin"", ""Admin123"");
 mWebService.Credentials = myCredentials;
Option 2:- Exposing Web Service using visual studio. Please check the following Steps:
1)	Create Proxy class using Visual studio and apply the following code snippet
     CalculatorServices.CalculatorService client = new CalculatorServices.CalculatorService();
    //The below credential is required to login Blue Prism
      NetworkCredential  myCredentials = new NetworkCredential(""admin"", ""Admin123"");
       client.Credentials = myCredentials;
       string SessionID = client.Initialise();
       Response.Write(""Initialised"");
       client.Calculator(SessionID);
       client.CleanUp(SessionID);
Thanks,
Rajiv