Trying to understand your requirement Statement 1 and 2 I have created SAS Stored Process with several input parameters and have deployed it as Web Service. I am interested how can I call my new SAS Web Service.? There are many approaches to call this web service. You can use java code, you can use curl, proc http, postman, ARC client , Apache Jmeter to name a few. All depends on what you want to achieve. You can pass parameter as XML/JSON and obtain http POST OR GET response. It all depends on what is the purpose of the call and your stored process.
Statement 3 But maybe someone has some examples how SAS STP Web Service should be called/triggered using Groovy code?