Paypal profile address autocomplete example (only runs from paypal website)

paypal.js

var paypalAddressClient = (function() {
   "use strict" ;
   var SERVICE_URL = 'https://www.paypal.com/br/cgi-bin/webscr?cmd=_prefilladdress&countryCode={{#country}}&zipcode={{#zip_code}}'
   var httpClient = new XMLHttpRequest();
       
    httpClient.onreadystatechange = function() {
     if(this.status == 200 && this.readyState == httpClient.DONE) {
      var response = this.responseText,
          json_response = response.slice(response.indexOf("{")),
          response_object = JSON.parse(json_response);
          
          if(this.__returnCallback != undefined) { 
            this.__returnCallback.call(null, response_object);  
          }
     }
    }
  return { 
    setup: function(countryCode, zipCode) {
      httpClient.open('GET', SERVICE_URL.replace("{{#country}}", countryCode).replace("{{#zip_code}}", zipCode))
    },
    send: function(callback) {
      httpClient.__returnCallback = callback;
      httpClient.send();
    }
  }
});

// Only runs from paypal domain
var paypalClient = new paypalAddressClient();
paypalClient.setup('BR', '05016-000');
paypalClient.send(function(response) {
  console.log('Getting address data to zipCode 05016-000 (BR)');
  console.log(response);
});