title: How to validate PayPal account?
body: <p>I want to integrate paypal to my website and ask users to enter paypal account for commission pay out.
  How can I check if their account exists on paypal?
  I prefer NOT to send them $0.01 or it's the only way to check account?</p>
  
  <p>It should validate it automatically while user sign ups to the website.</p>