public TransactionResponse SubmitPrimaryTransaction(PrimaryTransaction payload, string region = null) { Signature signatureService = GetSignatureService(); string messageSignature = signatureService.Sign(JsonConvert.SerializeObject(payload)); return(payApi.SubmitPrimaryTransaction( CONTENT_TYPE, signatureService.ClientRequestId, GetApiKey(), signatureService.TimeStamp, payload, messageSignature, region )); }