Accessing web service JSON from cucumber/gherkin

I am using cucumber to perform integration test for an iOS app written in Objective C. I want to access JSON values from a web service call inside the app and confirm it elsewhere. From what I have seen it is possible to use something like: "When the client requests GET /fruits" to get the JSON. Where in Objective C do I name the web service call "fruits"? I have no problems accessing all the labels with accessibility identifier, but I guess there is a different method to address the web service calls.

Any help appreciated. Thanks!