public async Task <OkObjectResult> Refund(string transactionId, string outTradeNo, string outRefundNo, int refundFee,
string refundDesc)
{
var request = new RefundRequest();
request.AddParameters(new RefundModel()
{
OutTradeNo = outTradeNo,
RefundFee = refundFee,
TransactionId = transactionId,
OutRefundNo = outRefundNo,
RefundDesc = refundDesc
});
return(Ok(await _client.ExecuteAsync(request)));
}