diff --git a/engine/classes/DealProxy.php b/engine/classes/DealProxy.php
index a763a17..75cc887 100644
--- a/engine/classes/DealProxy.php
+++ b/engine/classes/DealProxy.php
@@ -1,10 +1,7 @@
 <?php
-
 /**
  * Proxy class for forwarding Deal API requests.
- *
- * Handles CORS, builds request headers (including session cookies),
- * forwards the request to the legacy API and returns the response.
+ * Compatible with PHP 5.6.
  */
 class DealProxy
 {
@@ -17,16 +14,16 @@ class DealProxy
     }
 
     /** Simple logger */
-    private function logMessage(string $message): void
+    private function logMessage($message)
     {
         $date = date('Y-m-d H:i:s');
         file_put_contents($this->logFile, "[$date] $message\n", FILE_APPEND);
     }
 
     /** Build the target URL based on incoming request */
-    private function buildTargetUrl(): string
+    private function buildTargetUrl()
     {
-        $path = $_GET['path'] ?? '';
+        $path = isset($_GET['path']) ? $_GET['path'] : '';
         unset($_GET['path']);
         $query = http_build_query($_GET);
         $apiUrl = "https://llar.joyworkdev.ru/api/" . ltrim($path, '/');
@@ -37,14 +34,14 @@ class DealProxy
     }
 
     /** Build headers for the forwarded request */
-    private function buildHeaders(): array
+    private function buildHeaders()
     {
-        $headers = [
+        $headers = array(
             'Accept: application/json',
-        ];
+        );
 
         // Preserve original Content-Type if present
-        $originalContentType = $_SERVER['CONTENT_TYPE'] ?? '';
+        $originalContentType = isset($_SERVER['CONTENT_TYPE']) ? $_SERVER['CONTENT_TYPE'] : '';
         if ($originalContentType) {
             $headers[] = 'Content-Type: ' . $originalContentType;
             $this->logMessage("Incoming Content-Type: '$originalContentType'");
@@ -64,17 +61,17 @@ class DealProxy
     }
 
     /** Forward the request using cURL and output the response */
-    private function forwardRequest(string $targetUrl, array $headers, string $method, string $body): void
+    private function forwardRequest($targetUrl, $headers, $method, $body)
     {
         $ch = curl_init();
-        curl_setopt_array($ch, [
+        curl_setopt_array($ch, array(
             CURLOPT_URL => $targetUrl,
             CURLOPT_RETURNTRANSFER => true,
             CURLOPT_CUSTOMREQUEST => $method,
             CURLOPT_POSTFIELDS => $body,
             CURLOPT_HTTPHEADER => $headers,
             CURLOPT_HEADER => false,
-        ]);
+        ));
 
         $response = curl_exec($ch);
         $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
@@ -89,9 +86,9 @@ class DealProxy
     }
 
     /** Main handler – called from index.php */
-    public function handle(): void
+    public function handle()
     {
-        // CORS headers – keep them here to be sent before any output
+        // CORS headers – must be sent before any output
         header('Access-Control-Allow-Origin: *');
         header('Access-Control-Allow-Credentials: true');
         header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS');