Reverse Engineering question.

Hello guys.

I friend of mine is challenging me to hack his application but I ve a little problem. I think it should be easy to do for you guys but I m noob and I need more informations.

In the application when I click a button a Webview is opened and a link is loaded. In this link I should put some informations. If the informations are correct the website loaded in the webview (or the server in which is hosted) comunicates to the applications that the informations are correct and the application unlock some cool functions I can use. My task is to find where the application retrieve these informations from the webview in order to change the verification method orin order to find where the application unlock the cool functions (but I m sure that if I find where the application is getting data from the webview I can find the rest). The problem is that I can't find nothing that is comunicating with the webview.

Can you suggest me if there is some functions or classes that are able to comunicate with webview or website?? Or if there is a fast way to find the function used ??