加注释

jsowell-pile/src/main/java/com/jsowell/pile/service/impl/WechatPayServiceImpl.java

@@ -321,6 +321,8 @@ public class WechatPayServiceImpl implements WechatPayService {
 		int payer_refund = refundNotifyResource.getAmount().getPayer_refund();
 		// 分转成元
 		BigDecimal refundAmount = new BigDecimal(payer_refund).divide(new BigDecimal(100), 2, RoundingMode.HALF_UP);
+
+		// 收到的退款回调是退余额的，扣除会员余额
 		if (StringUtils.equals(wxpayCallbackRecord.getPayScenario(), ScenarioEnum.BALANCE.getValue())) {
 			// 这笔支付订单原来是充值余额的，退款成功了，需要扣掉会员的本金金额
 			UpdateMemberBalanceDTO dto = new UpdateMemberBalanceDTO();