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Avalara.SDK - the Unified C# library for next gen Avalara services.

Unified SDK consists of services on top of which the Avalara Compliance Cloud platform is built. These services are foundational and provide functionality such as einvoicing.

Frameworks supported

  • .NET Core >=1.0
  • .NET Framework >=4.6

Dependencies

The DLLs included in the package may not be the latest version. We recommend using NuGet to obtain the latest version of the packages:

Install-Package Newtonsoft.Json
Install-Package JsonSubTypes
Install-Package System.ComponentModel.Annotations

Getting Started

using System;

using Avalara.SDK.Client;
using Avalara.SDK.Helpers;
using Avalara.SDK.Api.EInvoicing.V1;
using System.Threading.Tasks;

namespace Example
{
    public class Example
    {
        public static void Main()
        {

            Configuration configuration = new Configuration
            {
                Environment = AvalaraEnvironment.Sandbox,
                BearerToken = Environment.GetEnvironmentVariable("BEARER_TOKEN"), // Your Bearer token to connect to Avalara
                AppName = "Test",
                AppVersion = "1.0",
                MachineName = "LocalBox"
            };

            ApiClient apiClient = new ApiClient(configuration);

            var mandatesApi = new MandatesApi(apiClient);
            var requestParameters = new GetMandatesRequest();
            requestParameters.XAvalaraClient = "\"Swagger UI; 22.7.0; Custom; 1.0\"";  // string | Identifies the software you are using to call this API.  For more information on the client header, see [Client Headers](https://developer.avalara.com/avatax/client-headers/) . (optional)  (default to "Swagger UI; 22.7.0; Custom; 1.0")

            try
            {
                // Retrieve the list of Mandates
                var response = await mandatesApi.GetMandatesAsync(requestParameters);
                Debug.WriteLine(response);
            }
            catch (ApiException e)
            {
                Debug.Print("Exception when calling AddressesApi.ResolveAddressPost: " + e.Message);
                Debug.Print("Status Code: " + e.ErrorCode);
                Debug.Print(e.StackTrace);
            }

        }
    }
}

Documentation for API Endpoints

EInvoicing V1 API Documentation

Class Method HTTP request Description
DataInputFieldsApi GetDataInputFields GET /data-input-fields Returns the optionality of document fields for different country mandates
DocumentsApi DownloadDocument GET /documents/{documentId}/$download Returns a copy of the document
DocumentsApi FetchDocuments POST /documents/$fetch Fetch the inbound document from a tax authority
DocumentsApi GetDocumentList GET /documents Returns a summary of documents for a date range
DocumentsApi GetDocumentStatus GET /documents/{documentId}/status Checks the status of a document
DocumentsApi SubmitDocument POST /documents Submits a document to Avalara E-Invoicing API
InteropApi SubmitInteropDocument POST /interop/documents Submit a document
MandatesApi GetMandateDataInputFields GET /mandates/{mandateId}/data-input-fields Returns document field information for a country mandate, a selected document type, and its version
MandatesApi GetMandates GET /mandates List country mandates that are supported by the Avalara E-Invoicing platform
TradingPartnersApi BatchSearchParticipants POST /trading-partners/batch-searches Creates a batch search and performs a batch search in the directory for participants in the background.
TradingPartnersApi DownloadBatchSearchReport GET /trading-partners/batch-searches/{id}/$download-results Download batch search results in a csv file.
TradingPartnersApi GetBatchSearchDetail GET /trading-partners/batch-searches/{id} Get the batch search details for a given id.
TradingPartnersApi ListBatchSearches GET /trading-partners/batch-searches List all batch searches that were previously submitted.
TradingPartnersApi SearchParticipants GET /trading-partners Returns a list of participants matching the input query.

A1099 V2 API Documentation

Class Method HTTP request Description
Class1099FormsApi BulkUpsert1099Forms POST /1099/forms/$bulk Create/Update 1099 forms
Class1099FormsApi Call1099FormsPost POST /1099/forms Create a new 1099 form
Class1099FormsApi Delete1099Form DELETE /1099/forms/{formId} Delete a 1099 form
Class1099FormsApi Download1099FormPDF POST /1099/forms/$initiate-download Submit a download job to retrieve PDF forms
Class1099FormsApi Get1099Form GET /1099/forms/{formId} Get a single 1099 form
Class1099FormsApi List1099Forms GET /1099/forms List 1099 forms
Class1099FormsApi Update1099Form PUT /1099/forms/{formId} Update an existing form.
Class1099IssuersApi CreateIssuer POST /1099/issuers Create a new issuer
Class1099IssuersApi DeleteIssuer DELETE /1099/issuers/{issuerId} Delete an issuer
Class1099IssuersApi GetIssuer GET /1099/issuers/{issuerId} Get a single issuer
Class1099IssuersApi ListIssuers GET /1099/issuers List issuers
Class1099IssuersApi UpdateIssuer PUT /1099/issuers/{issuerId} Update an issuer
JobsApi GetJob GET /jobs/{jobId} Get status of an existing job
W4W8W9FormsApi CreateW9Form POST /w9/forms Create a new W9/W8/W4 form
W4W8W9FormsApi GetW9Form GET /w9/forms/{formId} Retrieve a W9/W8/W4 form
W4W8W9FormsApi GetW9Forms GET /w9/forms List W9/W4/W8 forms.
W4W8W9FormsApi W9FormRequestsFormRequestIdGet GET /w9/form-requests/{formRequestId} Get form request TODO-I Don't think this API should exist and instead we need POST /w9/{id}/request.
W9CompaniesApi CreateW9Company POST /w9/companies Creates a new company

Documentation for Models

EInvoicing V1 Model Documentation

A1099 V2 Model Documentation

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25.3.3 Latest
Mar 28, 2025
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