feat: add discount applications support

src/Enum/Fields/DiscountApplicationFields.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Shopify\Enum\Fields;
+
+class DiscountApplicationFields extends AbstractObjectEnum
+{
+    const TYPE = 'type';
+    const CODE = 'code';
+    const TITLE = 'title';
+    const DESCRIPTION = 'description';
+    const VALUE = 'value';
+    const VALUE_TYPE = 'value_type';
+    const ALLOCATION_METHOD = 'allocation_method';
+    const TARGET_SELECTION = 'target_selection';
+    const TARGET_TYPE = 'target_type';
+
+    public function getFieldTypes()
+    {
+        return array(
+            'type' => 'string',
+            'code' => 'string',
+            'title' => 'string',
+            'description' => 'string',
+            'value' => 'string',
+            'value_type' => 'string',
+            'allocation_method' => 'string',
+            'target_selection' => 'string',
+            'target_type' => 'string',
+        );
+    }
+}

src/Enum/Fields/OrderFields.php

@@ -52,6 +52,7 @@ class OrderFields extends AbstractObjectEnum
     const TAXES_INCLUDED = 'taxes_included';
     const TOKEN = 'token';
     const TOTAL_DISCOUNTS = 'total_discounts';
+    const DISCOUNT_APPLICATION = 'discount_applications';
     const TOTAL_LINE_ITEMS_PRICE = 'total_line_items_price';
     const TOTAL_PRICE = 'total_price';
     const TOTAL_PRICE_USD = 'total_price_usd';
@@ -112,6 +113,7 @@ public function getFieldTypes()
             'taxes_included' => 'boolean',
             'token' => 'string',
             'total_discounts' => 'string',
+            'discount_applications' => 'DiscountApplication[]',
             'total_line_items_price' => 'string',
             'total_price' => 'string',
             'total_price_usd' => 'string',

src/Object/DiscountApplication.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Shopify\Object;
+
+use Shopify\Enum\Fields\DiscountApplicationFields;
+
+class DiscountApplication extends AbstractObject
+{
+    public static function getFieldsEnum()
+    {
+        return DiscountApplicationFields::getInstance();
+    }
+}