Squashed commit message

backend/src/app/Exceptions/CustomExceptionHandler.php

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+<?php
+
+namespace App\Exceptions;
+
+use Acme\ECommerceFramework\Contracts\ExceptionHandlerInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+use Acme\ECommerceFramework\Telegram\Exceptions\TelegramInvalidSignatureException;
+use Psr\Log\LoggerInterface;
+use Throwable;
+
+class CustomExceptionHandler implements ExceptionHandlerInterface
+{
+    public function respond(Throwable $exception): ?JsonResponse
+    {
+        if ($exception instanceof TelegramInvalidSignatureException) {
+            return new JsonResponse([
+                'error' => 'Invalid Signature',
+                'code' => 'NO_INIT_DATA',
+            ], Response::HTTP_BAD_REQUEST);
+        }
+
+        return null;
+    }
+}