/// <summary>
/// Refund tien cho giao dich thanh toan offline
/// </summary>
/// <param name="partnerCode">Ma doi tac do momo cung cap</param>
/// <param name="requestId">Request id</param>
/// <param name="merchantRefId">Ma don hang luu tren he thong momo</param>
/// <param name="amount">So tien can refund</param>
/// <param name="momoTransId">Ma giao dich momo</param>
/// <param name="description"></param>
/// <param name="publicKey">Public key do momo cung cap</param>
/// <param name="test">Test=true la moi truong test, test=false la moi truong production. Mac dinh la false</param>
/// <returns></returns>
public static string RefundTransactionPayOffline(string partnerCode,
string requestId,
string merchantRefId,
string amount,
string momoTransId,
string description,
string publicKey,
bool test = false)
{
string endpoint = test
? "https://test-payment.momo.vn/pay/refund"
: "https://payment.momo.vn/pay/refund";
string version = CommonConstant.MOMO_VERSION;
publicKey = RsaKeyConverter.PemToXml(RsaKeyConverter.FormatPem(publicKey,
"PUBLIC KEY"));
//get hash
MoMoSecurity momoCrypto = new MoMoSecurity();
string hash = momoCrypto.buildRefundHash(partnerCode,
merchantRefId,
momoTransId,
Convert.ToInt64(amount),
description,
publicKey);
//request to MoMo
string jsonRequest = "{\"partnerCode\":\"" + partnerCode + "\",\"requestId\":\"" + requestId + "\",\"version\":" + version + ",\"hash\":\"" + hash + "\"}";
//response from MoMo
string responseFromMomo = PaymentRequest.sendPaymentRequest(endpoint,
jsonRequest);
Logger.Debug(responseFromMomo);
return(responseFromMomo);
}