public async Task <TransactionResponse> TransactionInquiryAsync(string transactionId, string storeId = null, string region = null)
{
Signature signatureService = GetSignatureService();
string messageSignature = signatureService.Sign();
return(await payApi.TransactionInquiryAsync(
CONTENT_TYPE,
signatureService.ClientRequestId,
GetApiKey(),
signatureService.TimeStamp,
transactionId,
messageSignature,
region,
storeId
));
}