catalog/controller/extension/payment/wechat_pay.php

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<?php
/**
 * @package		OpenCart
 * @author		Meng Wenbin
 * @copyright	Copyright (c) 2010 - 2017, Chengdu Guangda Network Technology Co. Ltd. (https://www.damicms.com/)
 * @license		https://opensource.org/licenses/GPL-3.0
 * @link		https://www.damicms.com
 */

class ControllerExtensionPaymentWechatPay extends Controller {
	public function index() {
		$data['button_confirm'] = $this->language->get('button_confirm');

		$data['redirect'] = $this->url->link('extension/payment/wechat_pay/qrcode');

		return $this->load->view('extension/payment/wechat_pay', $data);
	}

	public function qrcode() {
		$this->load->language('extension/payment/wechat_pay');

		$this->document->setTitle($this->language->get('heading_title'));
		$this->document->addScript('catalog/view/javascript/qrcode.js');

		$data['breadcrumbs'] = array();

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('text_home'),
			'href' => $this->url->link('common/home')
		);

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('text_checkout'),
			'href' => $this->url->link('checkout/checkout')
		);

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('text_qrcode'),
			'href' => $this->url->link('extension/payment/wechat_pay/qrcode')
		);

		$this->load->model('checkout/order');

		$order_info = $this->model_checkout_order->getOrder($this->session->data['order_id']);

		$order_id = trim($order_info['order_id']);
		$data['order_id'] = $order_id;
		$subject = trim($this->config->get('config_name'));
		$currency = $this->config->get('payment_wechat_pay_currency');
		$total_amount = trim($this->currency->format($order_info['total'], $currency, '', false));
		$notify_url = HTTP_SERVER . "payment_callback/wechat_pay"; //$this->url->link('wechat_pay/callback');

		$options = array(
			'appid'			 =>  $this->config->get('payment_wechat_pay_app_id'),
			'appsecret'		 =>  $this->config->get('payment_wechat_pay_app_secret'),
			'mch_id'			=>  $this->config->get('payment_wechat_pay_mch_id'),
			'partnerkey'		=>  $this->config->get('payment_wechat_pay_api_secret'),
			'cachepath'         =>  DIR_LOGS . 'wechat/'
		);