//使用方法一:
* 配置好自己的參數(shù),注意這里的兩個(gè)證書路徑得根據(jù)你自己的項(xiàng)目證書路徑來寫,同時(shí)存放證書的目錄要開放可讀權(quán)限
* 單純的支付不需要證書 , 退款的時(shí)候需要證書
$config = array(
'appid' => 'wx123456789876',
'mch_id' => '123456789',
'pay_apikey' => '123456789876123456789876123456789876',
'api_cert' => getcwd().'/cert/apiclient_cert.pem',
'api_key' => getcwd().'/cert/apiclient_key.pem'
);

$wxpay = new WxPay($config); //初始化類(同時(shí)傳遞參數(shù))
$data = $wxpay->wxpay($openid,$total_fee,$body,$order_sn); //微信支付,將返回值$data(json格式)返回給頁面,進(jìn)行JSAPI支付
$wxpay->refund($transaction_id,$out_refund_no,$total_fee,$refund_fee); //微信退款


//使用方法二:
$wxpay = new WxPay(); //初始化類

$wxpay->appid = 'wx123456789876'; //配置參數(shù)
$wxpay->mch_id = '123456789';
$wxpay->pay_apikey = '123456789876123456789876123456789876';
$wxpay->api_cert = getcwd().'/cert/apiclient_cert.pem';
$wxpay->api_key = getcwd().'/cert/apiclient_key.pem';

$data = $wxpay->wxpay($openid,$total_fee,$body,$order_sn); //微信支付,將返回值$data(json格式)返回給頁面,進(jìn)行JSAPI支付
$wxpay->refund($transaction_id,$out_refund_no,$total_fee,$refund_fee); //微信退款