[fix] repair some errors for CE Phoenix

- added verification for HTTP_X_REQUESTED_WITH existence
- removed unnecessary "language.php" inclusion (it is included /instantiated in includes\classes\application.php)
- changed .htaccess modification from "Allow from all" to  "Require all granted" for paylike.php file to be accesible on ajax.

Author: luciandex

README_Phoenix.md

@@ -7,7 +7,7 @@ Released under the GPL V3 license: https://opensource.org/licenses/GPL-3.0
 
 ## Supported osCommerce versions
 
-*The plugin has been tested with osCommerce CE Phoenix up to v1.0.7.10
+*The plugin has been tested with osCommerce CE Phoenix up to v1.0.7.18
 
 ## Installation
 
@@ -27,7 +27,7 @@ Released under the GPL V3 license: https://opensource.org/licenses/GPL-3.0
   6. In: `includes/.htaccess` add:
       ```
       <FilesMatch "paylike.php">
-         Allow from all
+         Require all granted
       </FilesMatch>
 
       ```
@@ -66,7 +66,7 @@ Released under the GPL V3 license: https://opensource.org/licenses/GPL-3.0
       ```
       Before ```<div class="row no-gutters">``` line.
 
-  8. Install the Paylike module from modules -> payment in the admin  
+  8. Install the Paylike module from modules -> payment in the admin
   9. Insert the app key and your public key in the settings and enable the plugin
 
 ## Updating settings

upload_ce_phoenix/includes/modules/paylike.php

@@ -1,5 +1,5 @@
 <?php
-if ($_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' && isset($_POST['action'])) {
+if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' && isset($_POST['action'])) {
     chdir('../../');
     $rootPath = dirname(dirname(dirname($_SERVER['SCRIPT_FILENAME'])));
     require $rootPath . '/includes/application_top.php';
@@ -10,7 +10,6 @@
     define('MODULE_PAYMENT_PAYLIKE_VERSION', '0.4');
 
     if (isset($_POST['action']) && $_POST['action'] === 'getOrderTotalsData') {
-        include($rootPath.'/includes/classes/language.php');
         $order = new order();
 
         /** Load paylike currencies file with some needed currencies attributes. */
@@ -39,7 +38,7 @@
             'test_mode'=>MODULE_PAYMENT_PAYLIKE_TRANSACTION_MODE,
             'store_name'=>$_SESSION['PAYLIKE_TITLE']?:STORE_NAME,
             'currency'=>$order->info['currency'],
-            'amount'=>(int)number_format($order->info['total']*$order->info['currency_value'], 2, '.', '')*100,
+            'amount'=>number_format($order->info['total']*$order->info['currency_value'], 2, '.', '')*100,
             'exponent'=>get_paylike_currency($order->info['currency'])['exponent'],
             'locale'=>key($current_lang),
             'custom'=>[