title: Can I get payer_id with "Login with Paypal"?
body: <p>I'm integrating Log In with PayPal - JavaScript Button.
  <a href="https://developer.paypal.com/webapps/developer/docs/integration/direct/log-in-with-paypal/js_button/" rel="noreferrer">https://developer.paypal.com/webapps/developer/docs/integration/direct/log-in-with-paypal/js_button/</a></p>
  
  <p>I need "payer_id" of the user who logged in with paypal.
  But it's NOT included in a response.</p>
  
  <p>A response of "4. Get User's PayPal Profile Data" in above integration guide is like this :</p>
  
  <p><code>
  {
      "family_name":"Ito",
      "name":"Gen Ito",
      "account_type":"BUSINESS",
      "given_name":"Gen",
      "user_id":"ttps://www.paypal.com/webapps/auth/identity/user/xxxxxxxxxxxxxxxxx",
      "verified_account":"true",
      "language":"ja_JP",
      "zoneinfo":"Asia/Tokyo",
      "locale":"ja_JP",
      "email":"xxx@xxx",
      "account_creation_date":"2011-11-18",
      "birthday":"1982-08-02",
      "age_range":"26-30"
  }
  </code></p>
  
  <p>"payer_id" is listed in below, so I thought payer_id is available.
  <a href="https://developer.paypal.com/webapps/developer/docs/api/#get-user-information" rel="noreferrer">https://developer.paypal.com/webapps/developer/docs/api/#get-user-information</a></p>
  
  <p>Can I get payer_id with "Login with Paypal" ?
  Then should I use another/other request ?</p>