diff --git a/wx/V3/WxV3PaymentTait.php b/wx/V3/WxV3PaymentTait.php
index 3fdc34e..56c5eb4 100644
--- a/wx/V3/WxV3PaymentTait.php
+++ b/wx/V3/WxV3PaymentTait.php
@@ -73,12 +73,10 @@ trait WxV3PaymentTait
      */
     public function searchByOutTradeNo(string $orderNo): array
     {
-        $config = $this->getPayConfig();
-
-        $parseUrl = '/v3/pay/transactions/out-trade-no/' . $orderNo . '?mchid=' . $config->pay->wx->mchId;
-        $sign     = $this->signature('POST', urlencode($parseUrl), "");
-
-        $client = $this->createClient($sign, "");
+        $config   = $this->getPayConfig();
+        $parseUrl = '/v3/pay/transactions/out-trade-no/' . $orderNo;
+        $sign     = $this->signature('POST', $parseUrl, $json = json_encode(['mchid' => $config->pay->wx->mchId]));
+        $client   = $this->createClient($sign, $json);
         $client->get($parseUrl);
         $client->close();