diff --git a/module/oc_telegram_shop/upload/admin/controller/extension/module/tgshop.php b/module/oc_telegram_shop/upload/admin/controller/extension/module/tgshop.php
index 111635b..b81e5d5 100755
--- a/module/oc_telegram_shop/upload/admin/controller/extension/module/tgshop.php
+++ b/module/oc_telegram_shop/upload/admin/controller/extension/module/tgshop.php
@@ -308,6 +308,7 @@ class ControllerExtensionModuleTgshop extends Controller
     {
         return [
             'module_tgshop_status' => 1,
+            'module_tgshop_debug' => 0,
             'module_tgshop_app_name' => $this->config->get('config_meta_title'),
             'module_tgshop_app_icon' => $this->config->get('config_image') ?: $this->model_tool_image->resize(
                 'no_image.png',
@@ -415,6 +416,15 @@ TEXT,
                     'options' => static::$themes,
                     'help' => 'Выберите стиль, который будет использоваться при отображении вашего магазина в Telegram для ночного режима. <a href="https://daisyui.com/docs/themes/#list-of-themes" target="_blank">Посмотреть как выглядят темы</a>',
                 ],
+
+                'module_tgshop_debug' => [
+                    'type' => 'select',
+                    'options' => [
+                        0 => 'Выключено',
+                        1 => 'Включено',
+                    ],
+                    'help' => 'Режим разработчика. Рекомендуется включать только по необходимости. В остальных случаях, для нормальной работы магазина, должен быть выключен.',
+                ],
             ],
             'telegram' => [
                 'module_tgshop_mini_app_url' => [
@@ -457,9 +467,9 @@ HTML,
             'statistics' => [
                 'module_tgshop_yandex_metrika' => [
                     'type' => 'textarea',
-                    'placeholder' => 'Вставьте код счётчика Яндекс Метрики',
+                    'placeholder' => 'Вставьте код счётчика Яндекс Метрики.',
                     'rows' => 15,
-                    'help' => ''
+                    'help' => 'Для проверки интеграции через кнопку "Проверить" в интерфейсе Яндекс Метрики, необходимо сначала включить "Режим разработчика" на вкладке "Общие".'
                 ],
             ],
 
diff --git a/module/oc_telegram_shop/upload/admin/language/ru-ru/extension/module/tgshop.php b/module/oc_telegram_shop/upload/admin/language/ru-ru/extension/module/tgshop.php
index 799c701..7fc524b 100755
--- a/module/oc_telegram_shop/upload/admin/language/ru-ru/extension/module/tgshop.php
+++ b/module/oc_telegram_shop/upload/admin/language/ru-ru/extension/module/tgshop.php
@@ -33,6 +33,7 @@ $_['lbl_module_tgshop_enable_store'] = 'Разрешить покупки';
 $_['lbl_module_tgshop_feature_coupons'] = 'Промокоды';
 $_['lbl_module_tgshop_feature_vouchers'] = 'Подарочные сертификаты';
 $_['lbl_module_tgshop_home_banner_id'] = 'Баннер на главной';
+$_['lbl_module_tgshop_debug'] = 'Режим разработчика';
 
 // Entry
 $_['entry_status'] = 'Статус';
diff --git a/module/oc_telegram_shop/upload/catalog/controller/extension/tgshop/handle.php b/module/oc_telegram_shop/upload/catalog/controller/extension/tgshop/handle.php
index a0be385..3a64c76 100755
--- a/module/oc_telegram_shop/upload/catalog/controller/extension/tgshop/handle.php
+++ b/module/oc_telegram_shop/upload/catalog/controller/extension/tgshop/handle.php
@@ -7,6 +7,7 @@ use Cart\Currency;
 use Cart\Tax;
 use Openguru\OpenCartFramework\ImageTool\ImageTool;
 use Openguru\OpenCartFramework\ImageTool\ImageToolInterface;
+use Openguru\OpenCartFramework\Logger\LoggerInterface;
 use Openguru\OpenCartFramework\Logger\OpenCartLogAdapter;
 use Openguru\OpenCartFramework\OpenCart\Decorators\OcRegistryDecorator;
 
@@ -37,8 +38,11 @@ class ControllerExtensionTgshopHandle extends Controller
     {
         $this->session->data['language'] = $this->config->get('config_language');
 
+        $appDebug = filter_var($this->config->get('module_tgshop_debug'), FILTER_VALIDATE_BOOLEAN);
+
         $app = ApplicationFactory::create([
             'app_enabled' => filter_var($this->config->get('module_tgshop_status'), FILTER_VALIDATE_BOOLEAN),
+            'app_debug' => $appDebug,
             'oc_config_tax' => $this->config->get('config_tax'),
             'oc_default_currency' => $this->config->get('config_currency'),
             // ID группы покупателей, которая будет использоаваться в заказах через Телеграм.
@@ -107,7 +111,13 @@ class ControllerExtensionTgshopHandle extends Controller
         $app->singleton(Log::class, fn() => $this->log);
 
         $app
-            ->withLogger(fn() => new OpenCartLogAdapter($this->log, 'TeleCart'))
+            ->withLogger(
+                fn() => new OpenCartLogAdapter(
+                    $this->log,
+                    'TeleCart',
+                    $appDebug ? LoggerInterface::LEVEL_DEBUG : LoggerInterface::LEVEL_WARNING,
+                )
+            )
             ->bootAndHandleRequest();
     }
 
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Http/Request.php b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Http/Request.php
index 30dac5c..5823255 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Http/Request.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Http/Request.php
@@ -92,4 +92,27 @@ final class Request
 
         return $headers[mb_strtolower($name)] ?? null;
     }
+
+    /**
+     * @param array|string $key
+     * @return bool
+     */
+    public function has($key): bool
+    {
+         if (is_array($key)) {
+            foreach ($key as $k) {
+                if ($this->has($k)) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        if (array_key_exists($key, $this->query)) {
+            return true;
+        }
+
+        return $this->json($key) !== null;
+    }
 }
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/Logger.php b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/Logger.php
index 34c1634..ce9def4 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/Logger.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/Logger.php
@@ -81,4 +81,9 @@ class Logger implements LoggerInterface
             )
         );
     }
+
+    public function debug(string $message): void
+    {
+        $this->log($message, LoggerInterface::LEVEL_DEBUG);
+    }
 }
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/LoggerInterface.php b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/LoggerInterface.php
index 6d20ce1..2c1f1fa 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/LoggerInterface.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/LoggerInterface.php
@@ -6,12 +6,15 @@ use Throwable;
 
 interface LoggerInterface
 {
+    public const LEVEL_DEBUG = 0;
     public const LEVEL_INFO = 1;
     public const LEVEL_WARNING = 2;
     public const LEVEL_ERROR = 3;
 
     public function log($message, $level = self::LEVEL_INFO);
 
+    public function debug(string $message): void;
+
     public function info(string $message): void;
 
     public function warning(string $message): void;
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/OpenCartLogAdapter.php b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/OpenCartLogAdapter.php
index 3c02fee..3a6941b 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/OpenCartLogAdapter.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Logger/OpenCartLogAdapter.php
@@ -9,15 +9,21 @@ class OpenCartLogAdapter implements LoggerInterface
 {
     private Log $ocLogger;
     private string $namespace;
+    private int $minLogLevel;
 
-    public function __construct(Log $ocLogger, string $namespace)
+    public function __construct(Log $ocLogger, string $namespace, int $minLogLevel = LoggerInterface::LEVEL_WARNING)
     {
         $this->ocLogger = $ocLogger;
         $this->namespace = $namespace;
+        $this->minLogLevel = $minLogLevel;
     }
 
-    public function log($message, $level = self::LEVEL_INFO): void
+    public function log($message, $level = LoggerInterface::LEVEL_INFO): void
     {
+        if ($level < $this->minLogLevel) {
+            return;
+        }
+
         $this->ocLogger->write(
             sprintf(
                 "[%s] [%s] %s\n",
@@ -35,12 +41,12 @@ class OpenCartLogAdapter implements LoggerInterface
 
     public function warning(string $message): void
     {
-        $this->log($message, self::LEVEL_WARNING);
+        $this->log($message, LoggerInterface::LEVEL_WARNING);
     }
 
     public function error(string $message): void
     {
-        $this->log($message, self::LEVEL_ERROR);
+        $this->log($message, LoggerInterface::LEVEL_ERROR);
     }
 
     public function logException(Throwable $exception): void
@@ -59,6 +65,8 @@ class OpenCartLogAdapter implements LoggerInterface
     private function getLevelString($level): string
     {
         switch ($level) {
+            case LoggerInterface::LEVEL_DEBUG:
+                return 'DEBUG';
             case LoggerInterface::LEVEL_INFO:
                 return 'INFO';
             case LoggerInterface::LEVEL_WARNING:
@@ -69,4 +77,9 @@ class OpenCartLogAdapter implements LoggerInterface
                 return 'UNKNOWN';
         }
     }
+
+    public function debug(string $message): void
+    {
+        $this->log($message, LoggerInterface::LEVEL_DEBUG);
+    }
 }
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/SignatureValidator.php b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/SignatureValidator.php
index 3c6f3fa..69bad8d 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/SignatureValidator.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/SignatureValidator.php
@@ -2,20 +2,31 @@
 
 namespace Openguru\OpenCartFramework\Telegram;
 
+use Openguru\OpenCartFramework\Config\Settings;
 use Openguru\OpenCartFramework\Http\Request;
+use Openguru\OpenCartFramework\Logger\LoggerInterface;
 use Openguru\OpenCartFramework\Telegram\Exceptions\TelegramInvalidSignatureException;
 
 class SignatureValidator
 {
     private ?string $botToken;
+    private Settings $settings;
+    private LoggerInterface $logger;
 
-    public function __construct(?string $botToken = null)
+    public function __construct(Settings $settings, LoggerInterface $logger, ?string $botToken = null)
     {
         $this->botToken = $botToken;
+        $this->settings = $settings;
+        $this->logger = $logger;
     }
 
     public function validate(Request $request): void
     {
+        if ($this->settings->get('app_debug')) {
+            $this->logger->warning('Dev Mode is enabled. Ignoring Signature Validation.');
+            return;
+        }
+
         if (! $this->botToken) {
             return;
         }
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/TelegramServiceProvider.php b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/TelegramServiceProvider.php
index 07395c2..91bc906 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/TelegramServiceProvider.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/framework/Telegram/TelegramServiceProvider.php
@@ -3,7 +3,9 @@
 namespace Openguru\OpenCartFramework\Telegram;
 
 use Openguru\OpenCartFramework\Application;
+use Openguru\OpenCartFramework\Config\Settings;
 use Openguru\OpenCartFramework\Container\ServiceProvider;
+use Openguru\OpenCartFramework\Logger\LoggerInterface;
 
 class TelegramServiceProvider extends ServiceProvider
 {
@@ -16,6 +18,8 @@ class TelegramServiceProvider extends ServiceProvider
 
         $this->container->singleton(SignatureValidator::class, function (Application $app) {
             return new SignatureValidator(
+                $app->get(Settings::class),
+                $app->get(LoggerInterface::class),
                 $app->getConfigValue('telegram.bot_token'),
             );
         });
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/src/Handlers/SettingsHandler.php b/module/oc_telegram_shop/upload/oc_telegram_shop/src/Handlers/SettingsHandler.php
index 8d726ff..52b2be1 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/src/Handlers/SettingsHandler.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/src/Handlers/SettingsHandler.php
@@ -42,6 +42,7 @@ class SettingsHandler
 
         return new JsonResponse([
             'app_name' => $this->settings->get('app_name'),
+            'app_debug' => $this->settings->get('app_debug'),
             'app_icon' => $appIcon ?? '',
             'app_icon192' => $icons['icon192'] ?? '',
             'app_icon180' => $icons['icon180'] ?? '',
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/tests/Unit/RequestTest.php b/module/oc_telegram_shop/upload/oc_telegram_shop/tests/Unit/RequestTest.php
new file mode 100644
index 0000000..154f70d
--- /dev/null
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/tests/Unit/RequestTest.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Tests\Unit;
+
+use Openguru\OpenCartFramework\Http\Request;
+use PHPUnit\Framework\TestCase;
+
+class RequestTest extends TestCase
+{
+    public function testHasQueryParam(): void
+    {
+        $request = new Request(
+            ['foo' => 'bar'],
+            [],
+            [],
+            [],
+            []
+        );
+
+        $this->assertTrue($request->has('foo'));
+        $this->assertFalse($request->has('xyz'));
+    }
+
+    public function testHasJsonParam(): void
+    {
+        $request = new Request(
+            [],
+            [],
+            [],
+            [],
+            [],
+            [],
+            '{"foo":"bar"}'
+        );
+
+        $this->assertTrue($request->has('foo'));
+    }
+
+    public function testHasAtLeastOne(): void
+    {
+        $request = new Request(
+            ['foo' => 'bar'],
+            [],
+            [],
+            [],
+            [],
+            [],
+            '{"xyz":"bar"}'
+        );
+
+        $this->assertTrue($request->has([
+            'foo',
+            'xyz',
+            'some_other'
+        ]));
+
+        $this->assertFalse($request->has([
+            'abc',
+            'some_other'
+        ]));
+    }
+}
diff --git a/spa/src/App.vue b/spa/src/App.vue
index 154a097..3831b8c 100644
--- a/spa/src/App.vue
+++ b/spa/src/App.vue
@@ -10,6 +10,9 @@
 
         <section class="telecart-main-section">
           <FullscreenViewport v-if="platform === 'ios' || platform === 'android'" />
+
+          <AppDebugMessage v-if="settings.app_debug"/>
+
           <RouterView v-slot="{ Component, route }">
             <KeepAlive include="Home" :key="filtersStore.paramsHashForRouter">
               <component :is="Component" :key="route.fullPath" />
@@ -43,6 +46,7 @@ import {useProductFiltersStore} from "@/stores/ProductFiltersStore.js";
 import CartButton from "@/components/CartButton.vue";
 import Dock from "@/components/Dock.vue";
 import Navbar from "@/components/Navbar.vue";
+import AppDebugMessage from "@/components/AppDebugMessage.vue";
 
 const tg = useMiniApp();
 const platform = ref();
diff --git a/spa/src/components/AppDebugMessage.vue b/spa/src/components/AppDebugMessage.vue
new file mode 100644
index 0000000..44a7839
--- /dev/null
+++ b/spa/src/components/AppDebugMessage.vue
@@ -0,0 +1,9 @@
+<template>
+  <div role="alert" class="alert alert-warning rounded-none">
+    <svg xmlns="http://www.w3.org/2000/svg" class="h-6 w-6 shrink-0 stroke-current" fill="none" viewBox="0 0 24 24">
+      <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+            d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z"/>
+    </svg>
+    <span>Включен режим разработчика!</span>
+  </div>
+</template>
diff --git a/spa/src/components/Dock.vue b/spa/src/components/Dock.vue
index 8a6fddb..2830c37 100644
--- a/spa/src/components/Dock.vue
+++ b/spa/src/components/Dock.vue
@@ -73,8 +73,8 @@ function onDockItemClick() {
 
 <style scoped>
 .telecart-dock {
-  padding-bottom: calc(var(--tg-safe-area-inset-bottom) + 5px);
-  height: calc(70px + var(--tg-safe-area-inset-bottom));
+  padding-bottom: calc(var(--tg-safe-area-inset-bottom, 0px) + 5px);
+  height: calc(70px + var(--tg-safe-area-inset-bottom, 0px));
 }
 
 .telecart-dock-inner {
diff --git a/spa/src/components/FullScreenImageViewer.vue b/spa/src/components/FullScreenImageViewer.vue
index 8fc3b06..5cbbeb8 100644
--- a/spa/src/components/FullScreenImageViewer.vue
+++ b/spa/src/components/FullScreenImageViewer.vue
@@ -74,6 +74,6 @@ function onClose() {
 }
 
 .fullscreen-image-viewer .swiper-pagination-fraction {
-  bottom: calc(var(--tg-safe-area-inset-bottom, 0) + var(--tg-content-safe-area-inset-bottom, 0));
+  bottom: calc(var(--tg-safe-area-inset-bottom, 0px) + var(--tg-content-safe-area-inset-bottom, px));
 }
 </style>
diff --git a/spa/src/main.js b/spa/src/main.js
index eb6135b..9db716c 100644
--- a/spa/src/main.js
+++ b/spa/src/main.js
@@ -31,6 +31,7 @@ const appLoading = createApp(AppLoading);
 appLoading.mount('#app');
 
 settings.load()
+    .then(() => window.Telegram.WebApp.lockOrientation())
     .then(async () => {
         console.debug('Load default filters for the main page');
         const filtersStore = useProductFiltersStore();
@@ -63,7 +64,6 @@ settings.load()
     .then(() => { appLoading.unmount(); app.mount('#app'); })
     .then(() => window.Telegram.WebApp.ready())
     .then(() => settings.ya_metrika_enabled && injectYaMetrika())
-    .then(() => window.Telegram.WebApp.lockOrientation())
     .catch(error => {
         console.error(error);
         const errorApp = createApp(ApplicationError, {error});
diff --git a/spa/src/stores/SettingsStore.js b/spa/src/stores/SettingsStore.js
index 4d07b9e..fbe4fbd 100644
--- a/spa/src/stores/SettingsStore.js
+++ b/spa/src/stores/SettingsStore.js
@@ -4,6 +4,7 @@ import {fetchSettings} from "@/utils/ftch.js";
 export const useSettingsStore = defineStore('settings', {
     state: () => ({
         app_enabled: true,
+        app_debug: false,
         store_enabled: true,
         app_name: 'OpenCart Telegram магазин',
         app_icon: '',
@@ -39,6 +40,7 @@ export const useSettingsStore = defineStore('settings', {
             this.theme.dark = settings.theme_dark;
             this.ya_metrika_enabled = settings.ya_metrika_enabled;
             this.app_enabled = settings.app_enabled;
+            this.app_debug = settings.app_debug;
             this.store_enabled = settings.store_enabled;
             this.feature_coupons = settings.feature_coupons;
             this.feature_vouchers = settings.feature_vouchers;
diff --git a/spa/src/style.css b/spa/src/style.css
index 82a1791..5fb038f 100644
--- a/spa/src/style.css
+++ b/spa/src/style.css
@@ -32,9 +32,9 @@ html {
 
 .app-container {
     /*padding-top: calc(var(--tg-content-safe-area-inset-top) + var(--tg-safe-area-inset-top));*/
-    padding-bottom: var(--tg-safe-area-inset-bottom);
-    padding-left: var(--tg-safe-area-inset-left);
-    padding-right: var(--tg-safe-area-inset-right);
+    padding-bottom: var(--tg-safe-area-inset-bottom, 0px);
+    padding-left: var(--tg-safe-area-inset-left, 0px);
+    padding-right: var(--tg-safe-area-inset-right, 0px);
 }
 
 .safe-top {
@@ -57,7 +57,7 @@ html {
 }
 
 .telecart-main-section {
-    padding-top: calc(var(--tg-content-safe-area-inset-top) + var(--tg-safe-area-inset-top) + var(--tc-navbar-min-height));
+    padding-top: calc(var(--tg-content-safe-area-inset-top, 0rem) + var(--tg-safe-area-inset-top, 0rem) + var(--tc-navbar-min-height));
 }
 
 .swiper-pagination-bullets > .swiper-pagination-bullet {
diff --git a/spa/src/views/Cart.vue b/spa/src/views/Cart.vue
index 68851fb..621fe2e 100644
--- a/spa/src/views/Cart.vue
+++ b/spa/src/views/Cart.vue
@@ -174,6 +174,6 @@ onMounted(async () => {
 
 <style scoped>
 .btn-checkout {
-  bottom: calc(var(--spacing) * 22 + var(--tg-safe-area-inset-bottom))
+  bottom: calc(var(--spacing, 0px) * 22px + var(--tg-safe-area-inset-bottom, 0px))
 }
 </style>
\ No newline at end of file
diff --git a/spa/src/views/Home.vue b/spa/src/views/Home.vue
index 103d2f9..fef42f9 100644
--- a/spa/src/views/Home.vue
+++ b/spa/src/views/Home.vue
@@ -4,7 +4,7 @@
 
     <Banner/>
 
-    <div class="px-5 fixed z-50 w-full opacity-90" style="bottom: calc(var(--tg-safe-area-inset-bottom) + 80px);">
+    <div class="px-5 fixed z-50 w-full opacity-90" style="bottom: calc(var(--tg-safe-area-inset-bottom, 0px) + 80px);">
       <div class="flex justify-center">
         <button
             @click="showFilters"