Arthur Online
Arthur Conversations API

Threaded conversations and messages between managers, tenants, owners and contractors, with attached assets. 4 documented paths.
Documentation GitHub OpenAPI
OpenAPI Specification

openapi: 3.1.0
info:
  title: Arthur Conversations API
  version: 2.0.0
  description: Arthur Conversations API - the conversations 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: Assets
- name: Messages
- name: Conversations
paths:
  /conversations/{conversation_id}/assets:
    get:
      operationId: listAssetsOnConversation
      summary: List Assets on Conversation
      tags:
      - Assets
      parameters:
      - name: conversation_id
        in: path
        required: true
        description: Arthur conversation id.
        schema:
          type: integer
      - $ref: '#/components/parameters/EntityId'
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/Limit'
      - $ref: '#/components/parameters/Sort'
      - $ref: '#/components/parameters/Direction'
      description: This endpoint retrieves a list of assets associated with the given conversation ID.
      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'
  /conversations/{conversation_id}/messages:
    get:
      operationId: listMessagesRelatedToConversation
      summary: List Messages Related To Conversation
      tags:
      - Messages
      parameters:
      - name: conversation_id
        in: path
        required: true
        description: Arthur conversation id.
        schema:
          type: integer
      - $ref: '#/components/parameters/EntityId'
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/Limit'
      - $ref: '#/components/parameters/Sort'
      - $ref: '#/components/parameters/Direction'
      description: This retrieves a list of messages related to a conversation id .
      responses:
        '200':
          description: The request was completed successfully without errors.
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: integer
                  data:
                    type: array
                    items:
                      type: object
                  pagination:
                    $ref: '#/components/schemas/Pagination'
              example:
                status: 200
                data:
                - id: 1
                  conversation_id: 2
                  title: subject
                  message: Hello
                  sent_by_me: true
                  model: Property
                  model_id: 3
                  parent_id: 4
                  is_group: false
                  total_replies: 2
                  created_by:
                    id: 5
                    name: Brian Acton
                    group: manager
                  recipients:
                  - id: 6
                    full_name: Dan Dudley
                    is_read: false
                  sent_by:
                    id: 5
                    name: Brian Acton
                  created: '2020-06-04T14:29:14+01:00'
                  modified: '2020-06-04T14:29:14+01:00'
                - id: 12
                  conversation_id: 2
                  title: subject
                  message: Hello
                  sent_by_me: true
                  model: Property
                  model_id: 3
                  parent_id: 1
                  is_group: false
                  total_replies: 2
                  created_by:
                    id: 5
                    name: Brian Acton
                    group: manager
                  recipients:
                  - id: 6
                    full_name: Dan Dudley
                    is_read: false
                  sent_by:
                    id: 6
                    name: Dan Dudley
                  created: '2020-06-04T14:22:13+01:00'
                  modified: '2020-06-04T14:29:14+01:00'
                pagination:
                  page: 1
                  current: 2
                  count: 2
                  pageCount: 1
                  limit: 20
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: addMessagesRelatedToConversation
      summary: Add Messages Related To Conversation
      tags:
      - Messages
      parameters:
      - name: conversation_id
        in: path
        required: true
        description: Arthur conversation id.
        schema:
          type: integer
      - $ref: '#/components/parameters/EntityId'
      - $ref: '#/components/parameters/Strict'
      description: "Use this endpoint to add a new message related to a  conversation . The API will return\
        \ the saved data.\n\nSupported Fields \n The following fields are supported for the request body\n\
        \nField \n Example \n Type \n Required? \n\nmessage \n It's done \n String \n Yes"
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                message:
                  type: string
                  example: It's done
              required:
              - message
            example:
              message: No problem
      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
                  conversation_id: 123
                  title: Conversation Subject
                  message: No problem
                  model: Property
                  model_id: 123
                  parent_id: 1234
                  is_group: false
                  total_replies: 1234
                  created_by:
                    id: 123
                    name: Ronnie Wilson
                    group: manager
                  recipients:
                  - id: 123
                    full_name: Ronnie Wilson
                    entity_id: 123
                    is_read: true
                  - id: 123
                    full_name: Ronnie Wilson
                    entity_id: 123
                    is_read: false
                  sent_by:
                    id: 123
                    name: Ronnie Wilson
                  created: '2020-06-02T14:29:14+01:00'
                  modified: '2020-06-02T14:29:14+01:00'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /conversations/{conversation_id}/messages/{message_id}:
    get:
      operationId: viewMessageRelatedToConversation
      summary: View Message Related To Conversation
      tags:
      - Messages
      parameters:
      - name: conversation_id
        in: path
        required: true
        description: Arthur conversation id.
        schema:
          type: integer
      - name: message_id
        in: path
        required: true
        description: Arthur message id.
        schema:
          type: integer
      - $ref: '#/components/parameters/EntityId'
      description: 'This API endpoint retrieves the details of a single message, identified by its unique 
        message_id .


        Use this endpoint to view the specific details of a message within a conversation.'
      responses:
        '200':
          description: The request was completed successfully without errors.
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: integer
                  data:
                    type: array
                    items:
                      type: object
                  pagination:
                    $ref: '#/components/schemas/Pagination'
              example:
                status: 200
                data:
                - id: 1
                  conversation_id: 2
                  title: subject
                  message: Hello
                  sent_by_me: true
                  model: Property
                  model_id: 3
                  parent_id: 4
                  is_group: false
                  total_replies: 2
                  created_by:
                    id: 5
                    name: Brian Acton
                    group: manager
                  recipients:
                  - id: 6
                    full_name: Dan Dudley
                    is_read: false
                  sent_by:
                    id: 5
                    name: Brian Acton
                  created: '2020-06-04T14:29:14+01:00'
                  modified: '2020-06-04T14:29:14+01:00'
                pagination:
                  page: 1
                  current: 2
                  count: 2
                  pageCount: 1
                  limit: 20
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /conversations/{conversation_id}:
    get:
      operationId: listConversations
      summary: List Conversations
      tags:
      - Conversations
      parameters:
      - name: conversation_id
        in: path
        required: true
        description: Arthur conversation id.
        schema:
          type: integer
      - $ref: '#/components/parameters/EntityId'
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/Limit'
      - $ref: '#/components/parameters/Sort'
      - $ref: '#/components/parameters/Direction'
      description: This endpoint retrieves a list of conversations.
      responses:
        '200':
          description: The request was completed successfully without errors.
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: integer
                  data:
                    type: array
                    items:
                      type: object
                  pagination:
                    $ref: '#/components/schemas/Pagination'
              example:
                status: 200
                data:
                - id: 123
                  title: Subject 1
                  message_count: 1
                  model: ''
                  model_id: null
                  created_by:
                    id: 123
                    full_name: Ronnie Wilson
                  recipients:
                  - id: 123
                    full_name: Kevin Wilson
                  last_comment:
                    message: Sure!
                    created: '2020-04-22T12:03:28+01:00'
                    full_name: Ronnie Wilson
                  created: '2020-04-22T12:03:28+01:00'
                  modified: '2020-04-22T12:03:28+01:00'
                - id: 123
                  title: Subject 2
                  message_count: 1
                  model: Property
                  model_id: 1
                  created_by:
                    id: 123
                    full_name: Ronnie Wilson
                  recipients:
                  - id: 123
                    full_name: Kevin Wilson
                  last_comment:
                    message: Remember to clean on friday.
                    created: '2020-04-23T11:49:54+01:00'
                    full_name: Ronnie Wilson
                  created: '2020-04-23T11:49:54+01:00'
                  modified: '2020-04-30T11:49:54+01:00'
                pagination:
                  page: 1
                  current: 3
                  count: 2
                  pageCount: 1
                  limit: 20
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  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: {}
  parameters:
    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
    Sort:
      name: sort
      in: query
      required: false
      description: Field to sort the collection by.
      schema:
        type: string
    Direction:
      name: direction
      in: query
      required: false
      description: Sort direction.
      schema:
        type: string
        enum:
        - ASC
        - DESC
    Strict:
      name: strict
      in: query
      required: false
      description: When true, abort the request instead of auto-creating an unknown Simple type. POST
        and PUT only.
      schema:
        type: boolean
  schemas:
    Pagination:
      type: object
      description: Pagination block returned on every list response.
      properties:
        page:
          type: integer
        current:
          type: integer
        count:
          type: integer
        pageCount:
          type: integer
        limit:
          type: integer
    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
  responses:
    BadRequest:
      description: The request was invalid or malformed.
      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.
    NotFound:
      description: The request was sent to a location that does not exist in the API.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
Arthur Conversations API

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OpenAPI Specification
