diff --git a/wchat/wx/V3/WxV3PaymentNotify.php b/wchat/wx/V3/WxV3PaymentNotify.php
index 5585d99..37f5b86 100644
--- a/wchat/wx/V3/WxV3PaymentNotify.php
+++ b/wchat/wx/V3/WxV3PaymentNotify.php
@@ -9,10 +9,8 @@ use wchat\wx\V3\Notify\GoodsDetail;
 use wchat\wx\V3\Notify\NotifyModel;
 use wchat\wx\V3\Notify\PromotionDetail;
 
-const KEY_LENGTH_BYTE      = 32;
-const AUTH_TAG_LENGTH_BYTE = 16;
-const KEY_TYPE_PUBLIC      = 'public';
-const KEY_TYPE_PRIVATE     = 'private';
+const KEY_TYPE_PUBLIC  = 'public';
+const KEY_TYPE_PRIVATE = 'private';
 
 const LOCAL_FILE_PROTOCOL     = 'file://';
 const PKEY_PEM_NEEDLE         = ' KEY-';
@@ -22,10 +20,10 @@ const CHR_CR                  = "\r";
 const CHR_LF                  = "\n";
 
 const RULES                  = [
-    'private.pkcs1' => [self::PKEY_PEM_FORMAT, 'RSA PRIVATE', 16],
-    'private.pkcs8' => [self::PKEY_PEM_FORMAT, 'PRIVATE', 16],
-    'public.pkcs1'  => [self::PKEY_PEM_FORMAT, 'RSA PUBLIC', 15],
-    'public.spki'   => [self::PKEY_PEM_FORMAT, 'PUBLIC', 14],
+    'private.pkcs1' => [PKEY_PEM_FORMAT, 'RSA PRIVATE', 16],
+    'private.pkcs8' => [PKEY_PEM_FORMAT, 'PRIVATE', 16],
+    'public.pkcs1'  => [PKEY_PEM_FORMAT, 'RSA PUBLIC', 15],
+    'public.spki'   => [PKEY_PEM_FORMAT, 'PUBLIC', 14],
 ];
 const ASN1_OID_RSAENCRYPTION = '300d06092a864886f70d0101010500';
 const ASN1_SEQUENCE          = 48;
@@ -87,8 +85,7 @@ class WxV3PaymentNotify extends SmallProgram
         if (!$timeOffsetStatus || !$verifiedStatus) {
             return false;
         }
-        $this->decode();
-        return true;
+        return $this->decode($this->resource['ciphertext'], $this->resource['nonce'], $this->resource['associated_data']);
     }
 
 
@@ -133,18 +130,10 @@ class WxV3PaymentNotify extends SmallProgram
      */
     protected function rsaFrom($thing, string $type = KEY_TYPE_PRIVATE): \OpenSSLAsymmetricKey
     {
-        $pkey = ($isPublic = $type === KEY_TYPE_PUBLIC)
-            ? openssl_pkey_get_public($this->parse($thing, $type))
-            : openssl_pkey_get_private($this->parse($thing));
-
+        $pkey = ($isPublic = $type === KEY_TYPE_PUBLIC) ? openssl_pkey_get_public($this->parse($thing, $type)) : openssl_pkey_get_private($this->parse($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)
-            ));
+            throw new \UnexpectedValueException(sprintf('Cannot load %s from(%s), please take care about the \$thing input.', $isPublic ? 'publicKey' : 'privateKey', gettype($thing)));
         }
-
         return $pkey;
     }
 
@@ -157,10 +146,9 @@ class WxV3PaymentNotify extends SmallProgram
     protected function parse($thing, string $type = KEY_TYPE_PRIVATE): mixed
     {
         $src = $thing;
-        if (is_string($src) && is_int(strpos($src, PKEY_PEM_NEEDLE))
-            && $type === KEY_TYPE_PUBLIC && preg_match(PKEY_PEM_FORMAT_PATTERN, $src, $matches)) {
+        if (is_string($src) && is_int(strpos($src, PKEY_PEM_NEEDLE)) && $type === KEY_TYPE_PUBLIC && preg_match(PKEY_PEM_FORMAT_PATTERN, $src, $matches)) {
             [, $kind, $base64] = $matches;
-            $mapRules = (array)array_combine(array_column(RULES, 1/*column*/), array_keys(RULES));
+            $mapRules = array_combine(array_column(RULES, 1/*column*/), array_keys(RULES));
             $protocol = $mapRules[$kind] ?? '';
             if ('public.pkcs1' === $protocol) {
                 $src = sprintf('%s://%s', $protocol, str_replace([CHR_CR, CHR_LF], '', $base64));
@@ -213,12 +201,14 @@ class WxV3PaymentNotify extends SmallProgram
 
 
     /**
-     * @return void
-     * @throws Exception
+     * @param $ciphertext
+     * @param $nonce
+     * @param $associated_data
+     * @return bool
      */
-    public function decode(): void
+    public function decode($ciphertext, $nonce, $associated_data): bool
     {
-        $data                                = $this->decrypt($this->resource['ciphertext'], $this->resource['nonce'], $this->resource['associated_data']);
+        $data                                = $this->decrypt($ciphertext, $nonce, $associated_data);
         $this->notifyModel                   = new NotifyModel();
         $this->notifyModel->amount           = $data['amount'];
         $this->notifyModel->payer            = $data['payer'];
@@ -251,6 +241,7 @@ class WxV3PaymentNotify extends SmallProgram
             }
             $this->notifyModel->promotion_detail[] = $detail;
         }
+        return true;
     }