openapi: 3.0.3
info:
  title: EposNow HQ REST Categories Transactions API
  description: The EposNow HQ REST API lets developers programmatically interact with the cloud-based aspects of the Epos Now point of sale (POS) platform for retail and hospitality - products, categories, transactions (sales), customers, stock, tax rates, and devices. This document models the documented V2 API surface (base https://api.eposnowhq.com/api/V2). Epos Now recommends the newer V4 / "Global" API (https://api.eposnowhq.com/api/v4) for new integrations, which reorganizes the same domains; V4 per-resource paths are not fully enumerated here. All requests use HTTP Basic authentication with a per-device access token (Base64 of "API Key:API Secret") issued from the Back Office. List endpoints are paginated at up to 200 records per page via the page query parameter.
  version: V2
  contact:
    name: Epos Now Developers
    url: https://developer.eposnowhq.com/
servers:
- url: https://api.eposnowhq.com/api/V2
  description: EposNow HQ REST API (V2)
security:
- basicAuth: []
tags:
- name: Transactions
  description: Sales records (orders) captured at the point of sale.
paths:
  /Transaction:
    get:
      operationId: listTransactions
      tags:
      - Transactions
      summary: List transactions
      description: Returns a paginated list of transactions (sales records), up to 200 per page.
      parameters:
      - $ref: '#/components/parameters/Page'
      responses:
        '200':
          description: A paginated list of transactions.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Transaction'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createTransaction
      tags:
      - Transactions
      summary: Create a transaction
      description: Creates a new transaction (sale) with its line items and tenders.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Transaction'
      responses:
        '200':
          description: The created transaction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /Transaction/{Id}:
    parameters:
    - $ref: '#/components/parameters/Id'
    get:
      operationId: getTransaction
      tags:
      - Transactions
      summary: Get a transaction
      responses:
        '200':
          description: The requested transaction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    put:
      operationId: updateTransaction
      tags:
      - Transactions
      summary: Update a transaction
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Transaction'
      responses:
        '200':
          description: The updated transaction.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Transaction'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteTransaction
      tags:
      - Transactions
      summary: Delete a transaction
      responses:
        '200':
          description: Deletion confirmation.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  responses:
    Unauthorized:
      description: Missing or invalid Basic authentication credentials.
    NotFound:
      description: The requested resource was not found.
  parameters:
    Id:
      name: Id
      in: path
      required: true
      description: The unique identifier of the resource.
      schema:
        type: integer
    Page:
      name: page
      in: query
      required: false
      description: The page number of results to return (up to 200 records per page).
      schema:
        type: integer
        default: 1
  schemas:
    Transaction:
      type: object
      description: A sales record (order) captured at the point of sale.
      properties:
        Id:
          type: integer
        DeviceId:
          type: integer
        CustomerId:
          type: integer
        DateTime:
          type: string
          format: date-time
        Amount:
          type: number
        TransactionItems:
          type: array
          items:
            type: object
            additionalProperties: true
      additionalProperties: true
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: 'HTTP Basic authentication. The access token is the Base64 encoding of "API Key:API Secret" (the API Key, a colon, then the API Secret, with no spaces), sent as "Authorization: Basic {token}". Credentials are issued per API Device registered under Web Integrations in the Epos Now Back Office.'