add rest application and discount-status rest method

environments/dev/rest/web/index-test.php

@@ -0,0 +1,18 @@
+<?php
+
+// NOTE: Make sure this file is not accessible when deployed to production
+if (!in_array(@$_SERVER['REMOTE_ADDR'], ['127.0.0.1', '::1'])) {
+    die('You are not allowed to access this file.');
+}
+
+defined('YII_DEBUG') or define('YII_DEBUG', true);
+defined('YII_ENV') or define('YII_ENV', 'test');
+
+require(__DIR__ . '/../../vendor/autoload.php');
+require(__DIR__ . '/../../vendor/yiisoft/yii2/Yii.php');
+require(__DIR__ . '/../../common/config/bootstrap.php');
+require(__DIR__ . '/../config/bootstrap.php');
+
+$config = require(__DIR__ . '/../../tests/codeception/config/frontend/acceptance.php');
+
+(new yii\web\Application($config))->run();