Help about using webMethods with SAP

I just need orientation with the following problem because Im not a user of webMethods but this product is the integration tool used in my clients company:

  • We have an application that needs to read employee information from SAP using webMethods so I guess we need to ask to SAP staff to build a Stored Procedure that receives the employee number and returns the Name, Department and other information we need and after that we should ask to the webMethods staff to implement a service for that stored procedure and gave us the parameters needed in order to connect that service to our application and get the information we need. Is this correct or to have a service online requesting information from SAP could affect SAP`s performance?.

Thank you very much