diff --git a/wx/V3/WxV3PaymentNotify.php b/wx/V3/WxV3PaymentNotify.php
index 0aec437..debfad6 100644
--- a/wx/V3/WxV3PaymentNotify.php
+++ b/wx/V3/WxV3PaymentNotify.php
@@ -53,7 +53,7 @@ class WxV3PaymentNotify extends SmallProgram
      */
     public function verify(RequestInterface $request): bool
     {
-        $platformPublicKeyInstance = $this->rsaFrom($this->payConfig->pay->wx->mchKey, KEY_TYPE_PUBLIC);
+        $platformPublicKeyInstance = $this->rsaFrom($this->payConfig->pay->wx->mchCert, KEY_TYPE_PUBLIC);
         $inWechatpaySignature      = $request->getHeaderLine('Wechatpay-Signature');    // 请根据实际情况获取
         $inWechatpayTimestamp      = $request->getHeaderLine('Wechatpay-Timestamp');    // 请根据实际情况获取
         $inWechatpayNonce          = $request->getHeaderLine('Wechatpay-Nonce');        // 请根据实际情况获取
@@ -111,7 +111,7 @@ class WxV3PaymentNotify extends SmallProgram
      */
     protected function rsaFrom(string $thing, string $type = KEY_TYPE_PRIVATE): OpenSSLAsymmetricKey
     {
-        $pkey = (($isPublic = $type === KEY_TYPE_PUBLIC) ? openssl_pkey_get_public('file:/' . $thing) : openssl_pkey_get_private('file:/' . $thing));
+        $pkey = (($isPublic = $type === KEY_TYPE_PUBLIC) ? openssl_pkey_get_public('file://' . $thing) : openssl_pkey_get_private('file://' . $thing));
         if (false === $pkey) {
             throw new \UnexpectedValueException(sprintf('Cannot load %s from(%s), please take care about the $thing input.', $isPublic ? 'publicKey' : 'privateKey', gettype($thing)));
         }