title: Login with paypal using paypal ios sdk
body: <p>I have a requirement where a user can sell an item from his iOS app and another user can purchase it. So at the time of selling he need to login to PayPal using his credentials. I should be able know wether this user is a valid user.
  Initially i tried out this workflow using Paypal's identity api and log in with paypal api. My reference can be found <a href="https://devtools-paypal.com/guide/openid/php?interactive=ON&amp;env=sandbox" rel="nofollow">here</a>. </p>
  
  <p>I need to get this workflow done using PayPal's iOS SDK. I could find sample code and documentation on payment, future payment etc. But what i need is that:<br/>
  1. the user logs in to paypal<br/>2. Once login is successful, the app receives a response which will give the user's paypal email id and isVerified status.
  <br/> </p>
  
  <p>It would be very helpful if any one could advice me on how to achieve this work flow. </p>
  
  <p>Thanks in advance. </p>