title: How to identify that user has not deleted the app?
body: <p>I have developed the Phonegap App. </p>
  
  <p>I want to identify that app is installed in user mobile.</p>
  
  <p>When user install app, h/she will register with our API server to use the app. First screen of APP is registration form.</p>
  
  <p>We have maintained the UNIQUE user id so that we can identify the device and user.</p>
  
  <p>I have used the push notification in APP.</p>
  
  <p>Now I want to send the request to server from mobile that application is in mobile.</p>
  
  <p>I want to code such that mobile will send the request to API server after specific interval of time. Time will be in days.</p>
  
  <p>And the process to send request to server must run in background.</p>
  
  <p>Can anyone help regarding this??</p>