From bdac285ea265f6074406c63c88999013a93bedc8 Mon Sep 17 00:00:00 2001
From: justmd5 <heyjun2012@gmail.com>
Date: Wed, 24 Nov 2021 14:09:44 +0800
Subject: [PATCH] code optimize

---
 src/Api.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Api.php b/src/Api.php
index 9f85753..1fc42e7 100644
--- a/src/Api.php
+++ b/src/Api.php
@@ -32,7 +32,7 @@ public function __construct(PinDuoDuo $pinduoduo, $needToken = false)
      *
      * @return string
      */
-    private function signature($params)
+    private function signature($params): string
     {
         ksort($params);
         $paramsStr = '';