var user='email loggin';
var password='password of pcloud';

function make_base_auth(user, password) {
  var tok = user + ':' + password;
  var hash = btoa(tok);
  return "Basic " + hash;
}

$.ajax
  ({
    type: "GET",
    url: "https://api.pcloud.com/userinfo",
    dataType: 'json',
    async: false,
    data: '{}',
    beforeSend: function (xhr){
        xhr.setRequestHeader('Authorization', make_base_auth(username, password));
    },
    success: function (){
        alert('Working Fine');
    }
});