title: How to get email id or order id to database when user purchases my app from play store
body: <p>I want to get order id or email id of user when he purchases my app from play store.</p>
  
  <p>I want that when ever user purchases my app, the order id gets stored in my sql database. Next when user signup from my app and enters order id, that order id can be validated with stored order id.</p>
  
  <p>Or if I can get email id used for that purchase then I can store that purchase with that email id.</p>
  
  <p>Thanks</p>