openapi: 3.0.1
info:
  title: Kintsugi Tax Address Validation Transactions API
  description: REST API for the Kintsugi AI sales tax compliance and automation platform. Calculate US sales tax, VAT, and GST; sync transactions, products, and customers; validate addresses; manage physical nexus, exemptions, and registrations; and retrieve automated filings. Authentication uses an API key supplied in the x-api-key header together with the x-organization-id header identifying the organization. Endpoints, fields, and schemas in this document reflect Kintsugi's public API reference at docs.trykintsugi.com and are not exhaustive; consult the provider documentation for the authoritative contract.
  termsOfService: https://www.trykintsugi.com/terms-of-service
  contact:
    name: Kintsugi Support
    url: https://www.trykintsugi.com/support
  version: '1.0'
servers:
- url: https://api.trykintsugi.com/v1
  description: Kintsugi production API base URL
security:
- ApiKeyAuth: []
  OrganizationId: []
tags:
- name: Transactions
  description: Committed sales transactions and credit notes.
paths:
  /transactions:
    post:
      operationId: createTransaction
      tags:
      - Transactions
      summary: Create a transaction.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TransactionRequest'
      responses:
        '201':
          description: Transaction created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
    get:
      operationId: getTransactions
      tags:
      - Transactions
      summary: List transactions.
      parameters:
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/Size'
      responses:
        '200':
          description: A page of transactions.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TransactionPage'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /transactions/{id}:
    get:
      operationId: getTransactionById
      tags:
      - Transactions
      summary: Get a transaction by ID.
      parameters:
      - $ref: '#/components/parameters/Id'
      responses:
        '200':
          description: The requested transaction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: updateTransaction
      tags:
      - Transactions
      summary: Update a transaction.
      parameters:
      - $ref: '#/components/parameters/Id'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TransactionRequest'
      responses:
        '200':
          description: Transaction updated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
        '404':
          $ref: '#/components/responses/NotFound'
  /transactions/external/{external_id}:
    get:
      operationId: getTransactionByExternalId
      tags:
      - Transactions
      summary: Get a transaction by external ID.
      parameters:
      - $ref: '#/components/parameters/ExternalId'
      responses:
        '200':
          description: The requested transaction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
        '404':
          $ref: '#/components/responses/NotFound'
  /transactions/{id}/credit-notes:
    post:
      operationId: createCreditNoteByTransactionId
      tags:
      - Transactions
      summary: Create a credit note for a transaction.
      parameters:
      - $ref: '#/components/parameters/Id'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreditNoteRequest'
      responses:
        '201':
          description: Credit note created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
    patch:
      operationId: updateCreditNoteByTransactionId
      tags:
      - Transactions
      summary: Update a credit note for a transaction.
      parameters:
      - $ref: '#/components/parameters/Id'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreditNoteRequest'
      responses:
        '200':
          description: Credit note updated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
components:
  schemas:
    TransactionItemEstimate:
      type: object
      properties:
        external_id:
          type: string
        external_product_id:
          type: string
        date:
          type: string
          format: date-time
        amount:
          type: number
        quantity:
          type: number
          default: 1
        product_name:
          type: string
        product_category:
          type: string
        product_subcategory:
          type: string
        exempt:
          type: boolean
          default: false
      required:
      - amount
      - date
    Address:
      type: object
      properties:
        type:
          type: string
          enum:
          - SHIP_TO
          - BILL_TO
        street_1:
          type: string
        street_2:
          type: string
        city:
          type: string
        county:
          type: string
        state:
          type: string
        postal_code:
          type: string
        country:
          type: string
        full_address:
          type: string
      required:
      - postal_code
      - country
    CreditNoteRequest:
      type: object
      properties:
        external_id:
          type: string
        date:
          type: string
          format: date-time
        amount:
          type: number
        reason:
          type: string
    Transaction:
      allOf:
      - $ref: '#/components/schemas/TransactionRequest'
      - type: object
        properties:
          id:
            type: string
          total_tax_amount_calculated:
            type: string
          taxable_amount:
            type: string
          created_at:
            type: string
            format: date-time
          updated_at:
            type: string
            format: date-time
    TransactionPage:
      $ref: '#/components/schemas/Page'
    Page:
      type: object
      properties:
        items:
          type: array
          items:
            type: object
        total:
          type: integer
        page:
          type: integer
        size:
          type: integer
        pages:
          type: integer
    TransactionRequest:
      type: object
      properties:
        external_id:
          type: string
        date:
          type: string
          format: date-time
        currency:
          type: string
        status:
          type: string
        external_customer_id:
          type: string
        addresses:
          type: array
          items:
            $ref: '#/components/schemas/Address'
        transaction_items:
          type: array
          items:
            $ref: '#/components/schemas/TransactionItemEstimate'
      required:
      - external_id
      - date
      - currency
    Error:
      type: object
      properties:
        detail:
          type: string
        status_code:
          type: integer
  responses:
    ValidationError:
      description: Request validation failed.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key or organization ID.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: Resource not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    Page:
      name: page
      in: query
      schema:
        type: integer
        default: 1
    Size:
      name: size
      in: query
      schema:
        type: integer
        default: 50
    ExternalId:
      name: external_id
      in: path
      required: true
      schema:
        type: string
    Id:
      name: id
      in: path
      required: true
      schema:
        type: string
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: API key generated in the Kintsugi dashboard.
    OrganizationId:
      type: apiKey
      in: header
      name: x-organization-id
      description: Identifier of the organization the request acts on behalf of.