修改

library/utils/WxpayV2.php

@@ -99,6 +99,7 @@ class WxpayV2{
             'nonceStr'  => Formatter::nonce(),
             'package'   => 'prepay_id='.$info["prepay_id"],
         ];
+        var_dump(Formatter::queryStringLike(Formatter::ksort($params)));
         $params['paySign'] = Hash::sign(
             Hash::ALGO_MD5,//默认md5
             Formatter::queryStringLike(Formatter::ksort($params)),