🐛 #1405 微信支付创建订单接口中交易类型为JSAPI时的签名方法不默认为MD5，从请求对象中获取

Author: binarywang

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java

@@ -322,7 +322,11 @@ public <T> T createOrder(WxPayUnifiedOrderRequest request) throws WxPayException
       }
 
       case TradeType.JSAPI: {
-        String signType = SignType.MD5;
+        String signType = request.getSignType();
+        if (signType == null) {
+          signType = SignType.MD5;
+        }
+
         String appid = unifiedOrderResult.getAppid();
         if (StringUtils.isNotEmpty(unifiedOrderResult.getSubAppId())) {
           appid = unifiedOrderResult.getSubAppId();