composer require 'qyhly/wechat'
require __DIR__ . '/vendor/autoload.php';
$wechat = new \qyhly\Wechat\Wechat();
$accessToken = $wechat->getAccessToken;
require __DIR__ . '/vendor/autoload.php';
$wechatPay = new \qyhly\Wechat\WechatPay();
$res = $wechatPay->unifiedOrder();