title: Add paypal payment method to an Android app
body: <p>I would like to add paypal payment method to my app like in uber app. I want that the user log in once in the browser and from then on the app should book the money by sliding a button without needing to log in again or go to paypal website/app.
  I have checked everything and i just found the paypal sdk to add paypal button which navigat to paypal log in screen.
  I appreciate every answer.</p>