Avalara Authentication API

openapi: 3.1.0
info:
  title: Avalara 1099 & W-9 1099 Forms Authentication API
  description: The Avalara 1099 and W-9 API automates collection, validation, and e-filing of IRS forms including 1099 variants (1099-NEC, 1099-MISC, 1099-K, 1099-INT, 1099-DIV), 1095 forms, W-2, and 1042-S. It provides endpoints for creating, updating, managing, and filing various IRS information returns.
  version: '1.0'
  contact:
    name: Avalara Developer Relations
    url: https://developer.avalara.com/
    email: developer.relations@avalara.com
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
  termsOfService: https://legal.avalara.com/#siteterms
servers:
- url: https://api.avalara.com/1099/v1
  description: 1099 API Production
- url: https://api.sbx.avalara.com/1099/v1
  description: 1099 API Sandbox
security:
- bearerAuth: []
tags:
- name: Authentication
  description: Token management and authentication
paths:
  /auth/token:
    post:
      operationId: getAuthToken
      summary: Avalara Get Authentication Token
      description: Generates an authentication token for API access.
      tags:
      - Authentication
      security: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - username
              - password
              properties:
                username:
                  type: string
                password:
                  type: string
      responses:
        '200':
          description: Authentication token
          content:
            application/json:
              schema:
                type: object
                properties:
                  token:
                    type: string
                  expiresAt:
                    type: string
                    format: date-time
  /connect/token:
    post:
      operationId: getToken
      summary: Avalara Obtain an Access Token
      description: Obtains an OAuth 2.0 access token using client credentials, authorization code, or SAML assertion grant types.
      tags:
      - Authentication
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - grant_type
              - client_id
              - client_secret
              properties:
                grant_type:
                  type: string
                  enum:
                  - client_credentials
                  - authorization_code
                  - urn:ietf:params:oauth:grant-type:saml2-bearer
                  description: OAuth 2.0 grant type
                client_id:
                  type: string
                  description: OAuth client ID
                client_secret:
                  type: string
                  description: OAuth client secret
                scope:
                  type: string
                  description: Requested scopes (space-delimited)
                code:
                  type: string
                  description: Authorization code (for authorization_code grant)
                redirect_uri:
                  type: string
                  description: Redirect URI (for authorization_code grant)
                assertion:
                  type: string
                  description: SAML assertion (for SAML grant)
      responses:
        '200':
          description: Token generated successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TokenResponse'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OAuthError'
        '401':
          description: Invalid credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OAuthError'
  /connect/authorize:
    get:
      operationId: authorize
      summary: Avalara Authorization Endpoint
      description: Initiates the OAuth 2.0 authorization code flow by redirecting the user to the Avalara login page.
      tags:
      - Authentication
      parameters:
      - name: response_type
        in: query
        required: true
        schema:
          type: string
          enum:
          - code
      - name: client_id
        in: query
        required: true
        schema:
          type: string
      - name: redirect_uri
        in: query
        required: true
        schema:
          type: string
      - name: scope
        in: query
        schema:
          type: string
      - name: state
        in: query
        schema:
          type: string
      responses:
        '302':
          description: Redirect to login page
  /connect/revocation:
    post:
      operationId: revokeToken
      summary: Avalara Revoke a Token
      description: Revokes an active access or refresh token.
      tags:
      - Authentication
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - token
              properties:
                token:
                  type: string
                token_type_hint:
                  type: string
                  enum:
                  - access_token
                  - refresh_token
                client_id:
                  type: string
                client_secret:
                  type: string
      responses:
        '200':
          description: Token revoked
components:
  schemas:
    OAuthError:
      type: object
      properties:
        error:
          type: string
          enum:
          - invalid_request
          - invalid_client
          - invalid_grant
          - unauthorized_client
          - unsupported_grant_type
          - invalid_scope
        error_description:
          type: string
    TokenResponse:
      type: object
      properties:
        access_token:
          type: string
          description: The OAuth 2.0 access token
        token_type:
          type: string
          enum:
          - Bearer
        expires_in:
          type: integer
          description: Token expiry time in seconds
        scope:
          type: string
          description: Granted scopes
        refresh_token:
          type: string
          description: Refresh token (if applicable)
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: OAuth 2.0 bearer token
externalDocs:
  description: 1099 & W-9 API Documentation
  url: https://developer.avalara.com/api-reference/avalara1099/avalara1099/