Numeral Transactions API

openapi: 3.0.1
info:
  title: Numeral Customers Transactions API
  description: REST API for the Numeral (Numeral HQ) sales-tax compliance platform. Calculate real-time sales tax by customer location, record transactions and refunds, and manage products and customers. Registrations, nexus monitoring, filing, and remittance are delivered as managed platform services on top of the data captured through this API. Not affiliated with Numeral (numeral.io), an unrelated payment operations company.
  termsOfService: https://www.numeral.com/terms
  contact:
    name: Numeral Support
    url: https://www.numeral.com/
  version: '2026-03-01'
servers:
- url: https://api.numeralhq.com
  description: Numeral production API
security:
- bearerAuth: []
tags:
- name: Transactions
paths:
  /tax/transactions:
    post:
      operationId: createTransaction
      tags:
      - Transactions
      summary: Record a completed sale from a prior calculation.
      parameters:
      - $ref: '#/components/parameters/ApiVersion'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TransactionRequest'
      responses:
        '200':
          description: The recorded transaction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TransactionResponse'
  /tax/transactions/{transaction_id}:
    get:
      operationId: getTransaction
      tags:
      - Transactions
      summary: Retrieve a specific transaction.
      parameters:
      - $ref: '#/components/parameters/TransactionId'
      responses:
        '200':
          description: The requested transaction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TransactionResponse'
    delete:
      operationId: deleteTransaction
      tags:
      - Transactions
      summary: Delete a specific transaction.
      parameters:
      - $ref: '#/components/parameters/TransactionId'
      responses:
        '200':
          description: Deletion confirmation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DeletedResource'
components:
  schemas:
    LineItem:
      type: object
      properties:
        reference_product_id:
          type: string
        amount:
          type: integer
          description: Line amount in the smallest currency unit (e.g., cents).
        quantity:
          type: integer
        product_category:
          type: string
    DeletedResource:
      type: object
      properties:
        object:
          type: string
        deleted_at:
          type: string
          format: date-time
    TransactionRequest:
      type: object
      required:
      - calculation_id
      properties:
        calculation_id:
          type: string
        reference_order_id:
          type: string
        transaction_processed_at:
          type: string
          format: date-time
        metadata:
          type: object
          additionalProperties: true
    TransactionResponse:
      type: object
      properties:
        id:
          type: string
        object:
          type: string
        calculation_id:
          type: string
        reference_order_id:
          type: string
        customer_currency_code:
          type: string
        filing_currency_code:
          type: string
        line_items:
          type: array
          items:
            $ref: '#/components/schemas/LineItem'
        testmode:
          type: boolean
        metadata:
          type: object
          additionalProperties: true
  parameters:
    TransactionId:
      name: transaction_id
      in: path
      required: true
      schema:
        type: string
    ApiVersion:
      name: X-API-Version
      in: header
      required: false
      schema:
        type: string
        enum:
        - '2026-03-01'
        - '2026-01-01'
        - '2025-05-12'
        - '2024-09-01'
        default: '2024-09-01'
      description: API version. Defaults to 2024-09-01 when omitted.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Provide your Numeral API key as a Bearer token in the Authorization header.