fix pay v3

mallinkService/src/main/java/com/iformall/pay/WxPayV3.java

@@ -79,16 +79,12 @@ public class WxPayV3 {
 	
 	//小程序下单支付签名
 	public static String getMiniAppPayEntry(WxPayService payService,String appId,String timestamp,String noncestr,String prepayId) {
-		Map<String, String> sighMap = new HashMap();
-        sighMap.put("appId", appId+"\n");
-        sighMap.put("timeStamp", timestamp+"\n");
-        sighMap.put("nonceStr", noncestr+"\n");
-        sighMap.put("package", "prepay_id=" + prepayId+"\n");
+		StringBuffer sb = new StringBuffer();
+		sb.append(appId).append("\n").append(timestamp).append("\n").append(noncestr).append("\n").append("prepay_id=").append(prepayId).append("\n");
         WxPayConfig config = payService.getConfig();
         //初始化
         config.getVerifier();
-        String content = JSON.toJSONString(sighMap);
-        return new PrivateKeySigner(config.getCertSerialNo(), config.getPrivateKey()).signMessage(content.getBytes(StandardCharsets.UTF_8));
+        return new PrivateKeySigner(config.getCertSerialNo(), config.getPrivateKey()).signMessage(sb.toString().getBytes(StandardCharsets.UTF_8));
 	}
 	
 	//敏感信息加密