PriceRules and Discounts resources added

Author: Sergiu Cazac

lib/DiscountCode.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * @author Sergiu Cazac <kilobyte2007@gmail.com>
+ * Created at 5/06/19 2:09 AM UTC+03:00
+ *
+ * @see https://help.shopify.com/api/reference/discounts/discountcode Shopify API Reference for PriceRule
+ */
+
+namespace PHPShopify;
+
+
+class DiscountCode extends ShopifyResource
+{
+    /**
+     * @inheritDoc
+     */
+    protected $resourceKey = 'discount_code';
+}

lib/PriceRule.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * @author Sergiu Cazac <kilobyte2007@gmail.com>
+ * Created at 5/06/19 2:06 AM UTC+03:00
+ *
+ * @see https://help.shopify.com/api/reference/discounts/pricerule Shopify API Reference for PriceRule
+ */
+
+namespace PHPShopify;
+
+
+/*
+ * --------------------------------------------------------------------------
+ * PriceRule -> Child Resources
+ * --------------------------------------------------------------------------
+ * @property-read ShopifyResource $DiscountCode
+ *
+ * @method ShopifyResource DiscountCode(integer $id = null)
+ *
+ */
+class PriceRule extends ShopifyResource
+{
+    /**
+     * @inheritDoc
+     */
+    public $resourceKey = 'price_rule';
+
+    /**
+     * @inheritDoc
+     */
+    public $countEnabled = false;
+
+    /**
+     * @inheritDoc
+     */
+    protected $childResource = array(
+        'DiscountCode'
+    );
+}

lib/ShopifySDK.php

@@ -112,6 +112,7 @@ class ShopifySDK
         'Policy',
         'Product',
         'ProductVariant',
+        'PriceRule',
         'RecurringApplicationCharge',
         'Redirect',
         'ScriptTag',
@@ -137,6 +138,7 @@ class ShopifySDK
         'OrderRisk'         => 'Order',
         'ProductImage'      => 'Product',
         'ProductVariant'    => 'Product',
+        'DiscountCode'      => 'PriceRule',
         'Province'          => 'Country',
         'Refund'            => 'Order',
         'Transaction'       => 'Order',