小程序微信支付paySign多出空格问题

application/library/Payment/WxLitePay.php

@@ -38,7 +38,7 @@ class WxLitePay extends \Payment\TencentPay{
         $wxApiObj["nonceStr"] = \Our\CommonExtension::createNoncestr();
         $wxApiObj['package'] = 'prepay_id='.$this->prepay_id;
         $wxApiObj['signType'] = 'MD5';
-        $wxApiObj["paySign "] = $this->getSign($wxApiObj);
+        $wxApiObj["paySign"] = $this->getSign($wxApiObj);
         return $wxApiObj;
     }