Arthur Online Contractor Invoices API

openapi: 3.2.0
info:
  title: Arthur Financials Contractor Invoices API
  version: 2.0.0
  description: Arthur Financials API - the financials surface of the Arthur API v2, the UK property management platform from Arthur Online (an Aareon company). Derived operation-for-operation from the provider's public Postman Documenter collection at https://developer.arthuronline.co.uk/. Every request is scoped to an Arthur entity via the mandatory X-EntityID header and authorised with an OAuth 2.0 Authorization Code access token.
  contact:
    name: Arthur Online API Support
    url: https://support.arthuronline.co.uk/
  termsOfService: https://www.arthuronline.co.uk/terms-and-conditions/
  x-derived-from: collections/arthur-online.postman_collection.json
  x-derived-by: API Evangelist enrichment pipeline
  x-derived-date: '2026-07-26'
servers:
- url: https://api.arthuronline.co.uk/v2
  description: Arthur API v2 production
security:
- arthurOAuth: []
tags:
- name: Contractor Invoices
paths:
  /invoices:
    get:
      operationId: listInvoices
      summary: List Invoices
      tags:
      - Contractor Invoices
      parameters:
      - $ref: '#/components/parameters/EntityId'
      - name: workorder_id
        in: query
        required: false
        schema:
          type: string
        description: Filter by the connected workorder ID
      - name: status
        in: query
        required: false
        schema:
          type: string
        description: Filter by invoice status (paid, unpaid, pending, cancelled)
      - name: amount
        in: query
        required: false
        schema:
          type: string
        description: Filter by invoice amount
      - name: amount_outstanding
        in: query
        required: false
        schema:
          type: string
        description: Filter by invoice amount outstanding
      - name: amount_vat
        in: query
        required: false
        schema:
          type: string
        description: Filter by VAT amount
      - name: vat_percentage
        in: query
        required: false
        schema:
          type: string
        description: Filter by the percentage of VAT
      - name: paid_date
        in: query
        required: false
        schema:
          type: string
        description: Filters the contractor invoices by the paid date. Use the format yyyy-mm-dd to input the date
      - name: submitted
        in: query
        required: false
        schema:
          type: string
        description: To show only submitted invoices, set submitted flag to true
      - name: completed_date
        in: query
        required: false
        schema:
          type: string
        description: Filters the contractor invoices by the completed date. Use the format yyyy-mm-dd to input the date
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/Limit'
      - $ref: '#/components/parameters/Sort'
      - $ref: '#/components/parameters/Direction'
      description: This retrieves a list of invoices.
      responses:
        '200':
          description: The request was completed successfully without errors.
          content:
            application/json:
              schema:
                type: object
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /invoices/{invoice_id}:
    get:
      operationId: viewInvoices
      summary: View Invoices
      tags:
      - Contractor Invoices
      parameters:
      - name: invoice_id
        in: path
        required: true
        description: Arthur invoice id.
        schema:
          type: integer
      - $ref: '#/components/parameters/EntityId'
      description: 'This API endpoint retrieves the details of a single invoice, identified by its unique  invoice_id .


        Use this endpoint to view the specific details of an invoice.'
      responses:
        '200':
          description: The request was completed successfully without errors.
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: integer
                  data:
                    type: object
              example:
                status: 200
                data:
                  id: 123
                  workorder_id: 123
                  ref: W0/000
                  status: unpaid
                  location: Property address
                  amount: '1476.00'
                  amount_paid: '0.00'
                  amount_outstanding: '1476.00'
                  amount_vat: '246.00'
                  vat_percentage: '20.00'
                  paid_date: null
                  submitted: true
                  submitted_date: '2020-04-07T13:51:11+01:00'
                  completed_date: null
                  invoice_items:
                  - id: 123
                    name: Item name
                    description: Item description
                    amount: '1230.00'
                    quantity: 1
                  created_by:
                    id: 123
                    full_name: Zoltan Chivay
                  workorder:
                    id: 123
                    ref: WO000
                    title: Workorder title
                  contractor:
                    id: 123
                    full_name: Zoltan Chivay
                    status: live
                  created: '2020-08-07T15:50:39+01:00'
                  modified: '2020-09-04T15:23:55+01:00'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  parameters:
    Direction:
      name: direction
      in: query
      required: false
      description: Sort direction.
      schema:
        type: string
        enum:
        - ASC
        - DESC
    Sort:
      name: sort
      in: query
      required: false
      description: Field to sort the collection by.
      schema:
        type: string
    EntityId:
      name: X-EntityID
      in: header
      required: true
      description: The Arthur entity (account) the request is scoped to. Mandatory on every API call.
      schema:
        type: string
    Page:
      name: page
      in: query
      required: false
      description: Page number, between 1 and the total number of pages.
      schema:
        type: integer
        minimum: 1
    Limit:
      name: limit
      in: query
      required: false
      description: Items per page, between 1 and 100.
      schema:
        type: integer
        minimum: 1
        maximum: 100
  responses:
    BadRequest:
      description: The request was invalid or malformed.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: The request was sent to a location that does not exist in the API.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing, invalid or expired access token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error: expired_token
            message: This token has expired.
  schemas:
    Error:
      type: object
      description: Arthur error envelope.
      properties:
        status:
          type: integer
        error:
          type: string
          description: Machine-readable error code, e.g. expired_token.
        message:
          type: string
  securitySchemes:
    arthurOAuth:
      type: oauth2
      description: OAuth 2.0 Authorization Code flow. Access tokens are valid for 14 days; refresh tokens for 21 days. Register an application in Arthur Settings > OAuth Applications to obtain a client_id and client_secret.
      flows:
        authorizationCode:
          authorizationUrl: https://auth.arthuronline.co.uk/oauth/authorize
          tokenUrl: https://auth.arthuronline.co.uk/oauth/token
          refreshUrl: https://auth.arthuronline.co.uk/oauth/token
          scopes: {}