add rest application and discount-status rest method

environments/prod/rest/config/main-local.php

@@ -0,0 +1,9 @@
+<?php
+return [
+    'components' => [
+        'request' => [
+            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
+            'cookieValidationKey' => '',
+        ],
+    ],
+];

environments/prod/rest/config/params-local.php

@@ -0,0 +1,3 @@
+<?php
+return [
+];

environments/prod/rest/web/index.php

@@ -0,0 +1,18 @@
+<?php
+defined('YII_DEBUG') or define('YII_DEBUG', false);
+defined('YII_ENV') or define('YII_ENV', 'prod');
+
+require(__DIR__ . '/../../vendor/autoload.php');
+require(__DIR__ . '/../../vendor/yiisoft/yii2/Yii.php');
+require(__DIR__ . '/../../common/config/bootstrap.php');
+require(__DIR__ . '/../config/bootstrap.php');
+
+$config = yii\helpers\ArrayHelper::merge(
+    require(__DIR__ . '/../../common/config/main.php'),
+    require(__DIR__ . '/../../common/config/main-local.php'),
+    require(__DIR__ . '/../config/main.php'),
+    require(__DIR__ . '/../config/main-local.php')
+);
+
+$application = new yii\web\Application($config);
+$application->run();