Add PayPal webhook handler and marketing styles

- Implemented PayPal webhook for handling payment notifications, including signature verification and transaction updates.
- Created invoice generation and license management for software upgrades upon successful payment.
- Added comprehensive logging for debugging purposes.
- Introduced new CSS styles for the marketing file management system, including layout, toolbar, breadcrumb navigation, search filters, and file management UI components.

order.php

@@ -42,6 +42,23 @@ $order = ioServer($api_url,'');
 //Decode Payload
 if (!empty($order)){$order = json_decode($order,true);}else{$order = null;}
 
+//HANDLE STATUS CHANGE
+if ($update_allowed === 1){
+    if (isset($_POST['payment_status'])) {
+        //GET ALL POST DATA
+        $data = json_encode($_POST, JSON_UNESCAPED_UNICODE);
+        
+        //API call
+        $responses = ioServer('/v2/transactions', $data);
+        if ($responses === 'NOK'){
+
+        } else {
+        header('Location: index.php?page=order&id='.$_POST['id'].'&success_msg=2');
+        exit;
+        }
+    }
+}
+
 // Handle success messages
 if (isset($_GET['success_msg'])) {
     if ($_GET['success_msg'] == 1) {
@@ -112,11 +129,33 @@ $view .='
         <div class="order-detail">
             <h3>Payment Method</h3>
             <p>' . (${$payment_method} ?? $order['header']['payment_method'] ). '</p>
-        </div>
+        </div>';
+
+//STATUS CHANGE FORM
+if ($update_allowed === 1){
+    $view .='
+        <div class="order-detail">
+            <h3>Payment Status</h3>
+            <form action="" method="post" style="margin: 0;">
+                <p><select id="payment_status" name="payment_status" onchange="this.form.submit();" style="border: none; background: transparent; padding: 0; cursor: pointer;">
+                    <option value="0" '.($order['header']['payment_status']==0?' selected':'').'>'.$payment_status_0.'</option>
+                    <option value="1" '.($order['header']['payment_status']==1?' selected':'').'>'.$payment_status_1.'</option>
+                    <option value="101" '.($order['header']['payment_status']==101?' selected':'').'>'.$payment_status_101.'</option>
+                    <option value="102" '.($order['header']['payment_status']==102?' selected':'').'>'.$payment_status_102.'</option>
+                    <option value="103" '.($order['header']['payment_status']==103?' selected':'').'>'.$payment_status_103.'</option>
+                    <option value="999" '.($order['header']['payment_status']==999?' selected':'').'>'.$payment_status_999.'</option>
+                </select></p>
+                <input type="hidden" name="id" value="'.$order['header']['id'].'">
+            </form>
+        </div>';
+} else {
+    $view .='
         <div class="order-detail">
             <h3>Payment Status</h3>
             <p>' . (${$payment_status} ?? $order['header']['payment_status'] ). '</p>
-        </div>
+        </div>';
+}
+$view .='
         <div class="order-detail">
             <h3>Date</h3>
             <p>'.getRelativeTime($order['header']['created']). '</p>