$.ajax({
    type: 'POST',
    url: 'http://dev.leed.steko.com.ua/api/takedata-promo',
    crossDomain: true,
    data: $(this).serialize(),
    dataType: 'json',
    success: function(data) {
        console.log(data)
    },
    error: function (responseData, textStatus, errorThrown) {
        alert('POST failed.');
    }
});

header('Access-Control-Allow-Origin: '.$_SERVER['HTTP_ORIGIN']);
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');
header('Access-Control-Max-Age: 1000');
header('Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With');