REST API SENDER_SIGNS_LAST

CourseWriterAgreementInfo cwi = new CourseWriterAgreementInfo();

            DocumentCreationInfo documentCreationInfo = new DocumentCreationInfo();

            PostSignOptions postSignOptions = new PostSignOptions()

            {

                redirectUrl = "http://localhost:58455/CE/AdobeSignHandler?" + queryString

            };

            documentCreationInfo.postSignOptions = postSignOptions;

            //documentCreationInfo.callbackInfo = "https://localhost:58455/CE/Agreements?courseID=1035";

            documentCreationInfo.signatureType = SignatureType.ESIGN;

            documentCreationInfo.daysUntilSigningDeadline = 300;

            documentCreationInfo.signatureFlow = AdobeSignApi.Models.SignatureFlow.SENDER_SIGNS_LAST;

            AdobeSignApi.Models.FileInfo fileInfos = new AdobeSignApi.Models.FileInfo()

            {

                libraryDocumentId = _agreement.agreementTemplateId

            };

            documentCreationInfo.fileInfos = new List<AdobeSignApi.Models.FileInfo> { (fileInfos) };

            documentCreationInfo.name = _agreement.agreementName;

            RecipientSetInfo RecipientSetInfo = new RecipientSetInfo();

            RecipientSetInfo.recipientSetRole = RecipientRole.SIGNER;

            RecipientSetInfo.signingOrder = 1;

            RecipientSetInfo.recipientSetMemberInfos = new List<AdobeSignApi.Models.RecipientSetMemberInfo> { new  AdobeSignApi.Models.RecipientSetMemberInfo() {

                                                               email=_agreement.courseWriterAgreement.courseWriterEmailAddress } };

            //RecipientSetInfo.privateMessage = "Agrement sent from Library Document";

            documentCreationInfo.recipientSetInfos = new List<RecipientSetInfo> { RecipientSetInfo };

            //Set External Id Options

            ExternalId externalId = new AdobeSignApi.Models.ExternalId { group = "", id = externalId_id, @namespace = "" };

            documentCreationInfo.externalId = externalId;

            //Ends here

            cwi.documentCreationInfo = documentCreationInfo;

            //Interactive options.

            Options interactiveOptions = new Options();

            interactiveOptions.authoringRequested = false;

            interactiveOptions.autoLoginUser = true;

            interactiveOptions.noChrome = true;

            interactiveOptions.sendThroughWeb = true;

            interactiveOptions.sendThroughWebOptions = new SendThroughWebOptions();

            interactiveOptions.sendThroughWebOptions.fileUploadOptions = new FileUploadOptions() { libraryDocument = true, localFile = true, webConnectors = true };

            cwi.options = interactiveOptions;

            CEAdobeSignClient clientSign = _agreement.addAccessToken();

            //Interactive options ends.

             AgreementCreationResponse _agreementInfo = new AgreementCreationResponse();

            _agreementInfo = clientSign.CreateAgreement(cwi);

            _agreement.agreementCreationResponse = _agreementInfo;

*--------------------------------------*The API call is ***************************

public AgreementCreationResponse CreateAgreement(CourseWriterAgreementInfo newAgreement)

        {

            string serializedObject = JsonConvert.SerializeObject(newAgreement);

            using (StringContent content = new StringContent(serializedObject, Encoding.UTF8))

            {

                content.Headers.Remove("Content-Type");

                content.Headers.Add("Content-Type", "application/json");

                HttpResponseMessage result = client.PostAsync(apiEndpointVer + "/agreements", content).Result;

                if (result.IsSuccessStatusCode)

                {

                    string response = result.Content.ReadAsStringAsync().Result;

                    AgreementCreationResponse agreement = JsonConvert.DeserializeObject<AgreementCreationResponse>(response);

                    return agreement;

                }

                else

                {

                    string response = result.Content.ReadAsStringAsync().Result;

                    //HandleError(result.StatusCode, response, false);

                    return null;

                }

            }

        }