title: Is there a way to check if user has rated your app?
body: <p>I have been extensively searching through Internet but I could not able to come across so far then I have decided to ask the following question in SOF.</p>
  
  <p>My idea is to implement a selling and buying product in my application. There will be no charge from both sides(seller or buyer). However, I only want to receive user feedback to increase my app reputation in the AppStore. </p>
  
  <p>I would like to know how to check whether or not that an app user rate or leave comment for my application in the App Store. I need to know because I want to give him more advertising opportunities within the app.</p>
  
  <p>Sorry again, I wish to provide a sample code but I could not able to come anything to start with.</p>