title: Manually grant a Third-Party integration
body: <p>I'm looking to integrate paypal as a payment gateways for my customers.</p>
  
  <p>I know that to have a third-party permission, you can use RequestPermissions which will return  a token that you can use to ask permission to the user, then you will have the access token and secret token to call Paypal API.</p>
  
  <p>But in my integration I cannot use redirect and callback, so I need my customer to grant permission manually as describe in paypal documentation : <a href="https://developer.paypal.com/docs/classic/admin/third-party/" rel="nofollow">https://developer.paypal.com/docs/classic/admin/third-party/</a></p>
  
  <p>My question is, after that my customer add my app in his third-party permission, how can i retrieve the access token / secret token of the user with just his paypal's email ? Or maybe, I don't need it and I can call Paypal Api just with my customer's email?</p>
  
  <p>Thanks for your help.</p>