Pass response value of one service to other(With Authentication)?

Archive
,
2

Easily.

RequestObject ro = new RequestObject("x")
ro.setRestUrl("https://postman-echo.com/test")
ro.setRestRequestMethod("GET")

String resp = WS.sendRequest(ro).getResponseText()

Now you have your response saved in resp variable. You can either pass it to other method or parse it if you need.