bunq Attachment API

openapi: 3.2.0
info:
  title: bunq Public Attachment API
  description: 'Grounded, representative subset of the bunq Public API. bunq is a European (Dutch) neobank; its REST API lets account holders and licensed third parties read accounts, initiate SEPA and other payments, send and respond to payment requests, manage cards, export statements, upload attachments, and subscribe to event callbacks.


    IMPORTANT - bunq uses an unusual multi-step handshake before any business call can be made. All request/response bodies in the bunq API are wrapped in a top-level `Response` (list) envelope, and most responses also return a server signature. This document models the handshake plus a representative slice of the resource surface; it is NOT the full bunq API, which exposes hundreds of endpoints. Path segments such as `{userID}` and `{monetaryAccountID}` are numeric IDs returned by earlier calls. This spec is authored by API Evangelist from the public documentation at https://doc.bunq.com and is not an official bunq artifact; request/response schemas are simplified and several are modeled rather than copied verbatim.'
  version: v1
  contact:
    name: bunq API documentation
    url: https://doc.bunq.com
  license:
    name: bunq API Terms of Service
    url: https://doc.bunq.com
servers:
- url: https://api.bunq.com/v1
  description: Production
- url: https://public-api.sandbox.bunq.com/v1
  description: Sandbox
security:
- sessionToken: []
tags:
- name: Attachment
  description: Upload and retrieve attachment content.
paths:
  /user/{userID}/attachment-public:
    parameters:
    - $ref: '#/components/parameters/UserID'
    post:
      operationId: createAttachmentPublic
      tags:
      - Attachment
      summary: Upload a public attachment
      description: Uploads raw attachment bytes (for example an avatar or receipt image). The body is the binary content; `Content-Type` and `X-Bunq-Attachment-Description` headers describe it. The response returns a UUID used to reference or retrieve the content.
      requestBody:
        required: true
        content:
          application/octet-stream:
            schema:
              type: string
              format: binary
      responses:
        '200':
          description: The created attachment (UUID returned).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Response'
        '400':
          $ref: '#/components/responses/Error'
  /attachment-public/{attachmentPublicUUID}/content:
    parameters:
    - name: attachmentPublicUUID
      in: path
      required: true
      description: The UUID of the public attachment.
      schema:
        type: string
        format: uuid
    get:
      operationId: getAttachmentPublicContent
      tags:
      - Attachment
      summary: Download public attachment content
      description: Streams the raw bytes of a public attachment. Returns the binary content rather than a JSON envelope.
      responses:
        '200':
          description: The attachment binary content.
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  responses:
    Error:
      description: A bunq error response envelope.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Unauthorized:
      description: Missing/invalid session token or signature.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    ErrorResponse:
      type: object
      description: bunq error envelope.
      properties:
        Error:
          type: array
          items:
            type: object
            properties:
              error_description:
                type: string
              error_description_translated:
                type: string
    Response:
      type: object
      description: Generic bunq response envelope. Every bunq response wraps its payload in a top-level `Response` array whose items are single-key objects keyed by the resource type (for example `Payment`, `MonetaryAccount`, `Id`, `Token`). Modeled generically here; see doc.bunq.com for the exact per-resource shape.
      properties:
        Response:
          type: array
          items:
            type: object
            additionalProperties: true
  parameters:
    UserID:
      name: userID
      in: path
      required: true
      description: The numeric ID of the user.
      schema:
        type: integer
  securitySchemes:
    sessionToken:
      type: apiKey
      in: header
      name: X-Bunq-Client-Authentication
      description: Session token obtained from POST /session-server, sent on every business call. In addition, each request body must be signed with your private key and the signature sent in the X-Bunq-Client-Signature header (see the ClientSignature parameter). bunq is not a simple bearer-token API.
    installationToken:
      type: apiKey
      in: header
      name: X-Bunq-Client-Authentication
      description: Installation token from POST /installation, used only for the device-server and session-server handshake calls.