code: public static AlipayTradeRefundResponse tradeRefundToResponse(AlipayTradeRefundModel model)
  			throws AlipayApiException {
  		AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
  		request.setBizModel(model);
  		return AliPayApiConfigKit.getAliPayApiConfig().getAlipayClient().execute(request);
  	}
docs: 统一收单交易退款接口
  
  @param model
  {AlipayTradeRefundModel}
  @return {AlipayTradeRefundResponse}
  @throws {AlipayApiException}