first commit

catalog/controller/api/sale/coupon.php

@@ -0,0 +1,48 @@
+<?php
+namespace Opencart\Catalog\Controller\Api\Sale;
+/**
+ * Class Coupon
+ *
+ * @package Opencart\Catalog\Controller\Api\Sale
+ */
+class Coupon extends \Opencart\System\Engine\Controller {
+	/**
+	 * @return void
+	 */
+	public function index(): void {
+		$this->load->language('api/sale/coupon');
+
+		$json = [];
+
+		if (isset($this->request->post['coupon'])) {
+			$coupon = (string)$this->request->post['coupon'];
+		} else {
+			$coupon = '';
+		}
+
+		if ($coupon) {
+			$this->load->model('marketing/coupon');
+
+			$coupon_info = $this->model_marketing_coupon->getCoupon($coupon);
+
+			if (!$coupon_info) {
+				$json['error'] = $this->language->get('error_coupon');
+			}
+		}
+
+		if (!$json) {
+			if ($coupon) {
+				$json['success'] = $this->language->get('text_success');
+
+				$this->session->data['coupon'] = $coupon;
+			} else {
+				$json['success'] = $this->language->get('text_remove');
+
+				unset($this->session->data['coupon']);
+			}
+		}
+
+		$this->response->addHeader('Content-Type: application/json');
+		$this->response->setOutput(json_encode($json));
+	}
+}