static public string SendDocumentForSignature(string scenario, string recipientEmail, string senderEmail, string documentMessage, string documentName, string documentPath, string documentFileName, string callbackUrl)
        {
            EchoSignDocumentService19 ES = new EchoSignDocumentService19();

            Dictionary<string, string> oScenario = GetScenario(scenario);


            SenderInfo senderInfo = new SenderInfo();
            senderInfo.email = senderEmail;
            DocumentCreationInfo documentCreationInfo = new DocumentCreationInfo();
            documentCreationInfo.daysUntilSigningDeadline = 2;
            documentCreationInfo.message = documentMessage;
            documentCreationInfo.name = documentName;


            RecipientInfo recipientInfo = new RecipientInfo();
            recipientInfo.email = recipientEmail;

            recipientInfo.roleSpecified = true;
            recipientInfo.role = RecipientRole.SIGNER;

            CallbackInfo cbInfo = new CallbackInfo();
            if(callbackUrl!=null && callbackUrl.Length>0)
                cbInfo.signedDocumentUrl = callbackUrl;

            documentCreationInfo.callbackInfo = cbInfo;

            documentCreationInfo.recipients = new RecipientInfo[] { recipientInfo };
            var fileInfo = new PMGSPEUtils.AdobeEchoSign.com.echosign.secure.FileInfo();
            fileInfo.file = System.IO.File.ReadAllBytes(documentPath);
            fileInfo.mimeType = "application/msword";
            fileInfo.fileName = documentFileName;

            documentCreationInfo.fileInfos = new PMGSPEUtils.AdobeEchoSign.com.echosign.secure.FileInfo[] { fileInfo };

            SendDocumentInteractiveOptions sendDocumentInteractiveOptions = new SendDocumentInteractiveOptions();

            // sendDocumentInteractiveOptions

            var response = ES.sendDocumentInteractive(oScenario["apiKey"], senderInfo, documentCreationInfo, sendDocumentInteractiveOptions);

            if (response.success == false)
                throw (new Exception(response.errorMessage));

            return response.documentKey.documentKey;


        }