Thinkphp微信公衆號JSAPI支付，微信支付簡易實例

1. 官方微信支付文檔 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_1

2. 下載php版本demo
   
   3.具體調用代碼如下：

   
   <?php
   namespace app\common\library;
   class Pay
   {
   
   public function wxpay($openId,$goods,$order_sn,$total_fee,$attach='')
   {
       require_once APP_PATH."/common/library/php_sdk/lib/WxPay.Api.php";
       require_once APP_PATH."/common/library/php_sdk/lib/WxPay.JsApiPay.php";
       require_once APP_PATH."/common/library/php_sdk/example/log.php";
       // $logHandler= new CLogFileHandler(APP_ROOT."/Api/wxpay/logs/".date('Y-m-d').'.log');
       // $log = Log::Init($logHandler, 15);
   
       $tools = new \JsApiPay();
       if(empty($openId)) $openId = $tools->GetOpenid();
       $config = new \WxPayConfig();
       $input = new \WxPayUnifiedOrder();
       $input->SetBody($goods);     //商品名稱
       $input->SetAttach($attach);     //附加參數,可填可不填,填寫的話,裏邊字符串不能出現空格
       $input->SetOut_trade_no($order_sn);   //訂單號
       $input->SetTotal_fee($total_fee * 100);   //支付金額,單位:分
       $input->SetTime_start(date("YmdHis"));  //支付發起時間
       $input->SetTime_expire(date("YmdHis", time() + 600));//支付超時
       $input->SetGoods_tag("test3");
       //$input->SetNotify_url("http://".$_SERVER['HTTP_HOST']."/payment.php"); //支付回調驗證地址
       $input->SetNotify_url("http://".$_SERVER['HTTP_HOST']."/web/payment/notify/WeixinPay/notify");
       $input->SetTrade_type("JSAPI");    //支付類型
       $input->SetOpenid($openId);     //用戶openID
       $order = \WxPayApi::unifiedOrder($config,$input); //統一下單
       // dump($order);exit;
       $jsApiParameters = $tools->GetJsApiParameters($order);
       return $jsApiParameters;
   }

}

    $pay = new \app\common\library\Pay();
    $res = $pay->wxpay($this->openid,'開通會員',$order['order_no'],$order['money']);