修改

library/utils/WxpayV2.php

@@ -62,7 +62,7 @@ class WxpayV2{
             'notify_url'       => $this->config["NOTIFY_URL"], // 通知地址
             'trade_type'       => "JSAPI", // 交易类型
             'openid'           => $post["openid"],
-            'signType'         => ALGO_MD5,
+            'signType'         => Hash::ALGO_MD5,
         ];
 //        $params["sign"] = self::getSign($params);
         $result = $this->clientHttp("POST", $apiUrl, $params);
@@ -104,7 +104,7 @@ class WxpayV2{
             Formatter::queryStringLike(Formatter::ksort($params)),
             $this->config["ApiV2Key"],
         );
-        $params['signType'] = ALGO_MD5;
+        $params['signType'] = Hash::ALGO_MD5;
         return $params;
     }