小程序微信支付缺少openid

application/library/Payment/TencentPay.php

@@ -47,6 +47,8 @@ class TencentPay {
         $this->parameters['trade_type']= $this->tradeType;
         //$this->parameters['openid']=$_SESSION['openid'];
         //print_r($this->parameters);exit;
+
+        \Our\Log::getInstance()->write(json_encode($this->parameters));
         $prepay_id = $this->getPrepayId();
         $this->setPrepayId($prepay_id);
     }