diff --git a/wchat/wx/Recharge.php b/wchat/wx/Recharge.php
index b27b99b..f719352 100644
--- a/wchat/wx/Recharge.php
+++ b/wchat/wx/Recharge.php
@@ -110,15 +110,14 @@ class Recharge extends SmallProgram
 			'spbill_create_ip' => $_SERVER['REMOTE_ADDR'],
 			'notify_url'       => $this->config->getNotifyUrl(),
 			'trade_type'       => $this->config->getTradeType(),
+			'openid'           => $this->data['openid']
 		];
 
-		$data = array_merge($data, $this->data);
-
 		$key = $this->config->getKey();
 		$sign_type = $this->config->getSignType();
 
+		$data['sign_type'] = $sign_type;
 		$data['sign'] = Help::sign($data, $key, $sign_type);
-		$data['sign_type'] = $this->config->getSignType();
 
 		return Help::toXml($data);
 	}