How to get a value in web api through url

Question

I developed a web api in c# to post the data from my server to android mobile through url as a json object. With that URL my android developer integrated in android app to get the values. Now I need to get the values from android mobile and store in to my server. For that I need to develop a web api to get the json data from android.

 

In my project there is no design or front end. Through web service I need to get the data

 

Kindly help me out.