HoneyBook Invoices & Payments API

openapi: 3.0.3
info:
  title: HoneyBook API (Modeled)
  description: >-
    HoneyBook does not publish a self-serve public developer API or a public
    API reference. This document models the logical resource surface implied
    by HoneyBook's product (clients/leads, projects, contracts, proposals,
    invoices, payments, scheduler sessions) and by the trigger/action events
    exposed through its Zapier integration (New Client, New Inquiry, Project
    Booked, Payment Received, Project Stage Changed). An internal API host,
    https://api.honeybook.com, is live behind Cloudflare and clearly backs
    HoneyBook's own web/mobile apps and its native integrations, but
    HoneyBook has never published endpoint documentation, a client
    registration/OAuth flow, or a field dictionary for outside developers.
    Third-party integration guides (e.g. Rollout) reference an OAuth 2.0 flow
    against api.honeybook.com and a `/v1/` base path, but are inconsistent
    with each other on the exact token endpoint and grant type, and are not
    independently verifiable - treat every path, parameter, and schema below
    as an honest, sourced-but-unverified model, not a confirmed reference.
    Confirm directly with HoneyBook before attempting integration.
  version: '1.0-modeled'
  contact:
    name: HoneyBook
    url: https://www.honeybook.com
externalDocs:
  description: HoneyBook integrations and partnerships help center
  url: https://help.honeybook.com/en/collections/68941-integrations-and-partnerships
servers:
  - url: https://api.honeybook.com/v1
    description: Modeled base path (unverified; not publicly documented by HoneyBook)
security:
  - oauth2: []
tags:
  - name: Clients
    description: Clients and inquiries/leads captured through HoneyBook lead forms.
  - name: Projects
    description: The visual project pipeline - bookings and pipeline stage.
  - name: Contracts
    description: Contracts and e-signature agreements attached to a project.
  - name: Proposals
    description: Combined quote + contract + invoice documents sent to clients.
  - name: Invoices
    description: Invoices issued to clients within a project.
  - name: Payments
    description: Card and ACH payments made against invoices.
  - name: Scheduler
    description: Self-service session-type booking (Essentials/Premium plans).
  - name: Webhooks
    description: Modeled event subscription surface mirroring HoneyBook's Zapier triggers.
paths:
  /clients:
    get:
      operationId: listClients
      tags: [Clients]
      summary: List clients and inquiries
      description: >-
        Modeled from the "New Client" and "New Inquiry" Zapier triggers.
        Not a confirmed HoneyBook endpoint.
      parameters:
        - name: page
          in: query
          schema:
            type: integer
            default: 1
        - name: status
          in: query
          description: Filter by lead status (e.g. inquiry, client).
          schema:
            type: string
      responses:
        '200':
          description: A page of clients/inquiries.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Client'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createClient
      tags: [Clients]
      summary: Create a client or inquiry
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ClientInput'
      responses:
        '201':
          description: The created client.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Client'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /clients/{id}:
    parameters:
      - $ref: '#/components/parameters/Id'
    get:
      operationId: getClient
      tags: [Clients]
      summary: Retrieve a client
      responses:
        '200':
          description: The requested client.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Client'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: updateClient
      tags: [Clients]
      summary: Update a client
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ClientInput'
      responses:
        '200':
          description: The updated client.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Client'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /projects:
    get:
      operationId: listProjects
      tags: [Projects]
      summary: List projects
      parameters:
        - name: stage
          in: query
          description: Filter by pipeline stage.
          schema:
            type: string
      responses:
        '200':
          description: A page of projects.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createProject
      tags: [Projects]
      summary: Create a project
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ProjectInput'
      responses:
        '201':
          description: The created project.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /projects/{id}:
    parameters:
      - $ref: '#/components/parameters/Id'
    get:
      operationId: getProject
      tags: [Projects]
      summary: Retrieve a project
      description: >-
        Modeled from the "Project Booked" and "Project Stage Changed" Zapier
        triggers.
      responses:
        '200':
          description: The requested project.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: updateProject
      tags: [Projects]
      summary: Update a project (e.g. change pipeline stage)
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ProjectInput'
      responses:
        '200':
          description: The updated project.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /projects/{project_id}/contracts:
    parameters:
      - $ref: '#/components/parameters/ProjectId'
    get:
      operationId: listContracts
      tags: [Contracts]
      summary: List contracts for a project
      responses:
        '200':
          description: A list of contracts.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Contract'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: createContract
      tags: [Contracts]
      summary: Create a contract for a project
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContractInput'
      responses:
        '201':
          description: The created contract.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contract'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '422':
          $ref: '#/components/responses/ValidationError'
  /contracts/{id}:
    parameters:
      - $ref: '#/components/parameters/Id'
    get:
      operationId: getContract
      tags: [Contracts]
      summary: Retrieve a contract
      responses:
        '200':
          description: The requested contract.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contract'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /projects/{project_id}/proposals:
    parameters:
      - $ref: '#/components/parameters/ProjectId'
    get:
      operationId: listProposals
      tags: [Proposals]
      summary: List proposals for a project
      responses:
        '200':
          description: A list of proposals.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Proposal'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: createProposal
      tags: [Proposals]
      summary: Create a proposal (quote + contract + invoice) for a project
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ProposalInput'
      responses:
        '201':
          description: The created proposal.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Proposal'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '422':
          $ref: '#/components/responses/ValidationError'
  /proposals/{id}:
    parameters:
      - $ref: '#/components/parameters/Id'
    get:
      operationId: getProposal
      tags: [Proposals]
      summary: Retrieve a proposal
      responses:
        '200':
          description: The requested proposal.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Proposal'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /projects/{project_id}/invoices:
    parameters:
      - $ref: '#/components/parameters/ProjectId'
    get:
      operationId: listInvoices
      tags: [Invoices]
      summary: List invoices for a project
      responses:
        '200':
          description: A list of invoices.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Invoice'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: createInvoice
      tags: [Invoices]
      summary: Create an invoice for a project
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InvoiceInput'
      responses:
        '201':
          description: The created invoice.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Invoice'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '422':
          $ref: '#/components/responses/ValidationError'
  /invoices/{id}:
    parameters:
      - $ref: '#/components/parameters/Id'
    get:
      operationId: getInvoice
      tags: [Invoices]
      summary: Retrieve an invoice
      responses:
        '200':
          description: The requested invoice.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Invoice'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /payments:
    get:
      operationId: listPayments
      tags: [Payments]
      summary: List payments
      description: >-
        Modeled from the "Payment Received" Zapier trigger, which fires on
        any successfully paid client payment, manual or automatic.
      parameters:
        - name: invoice_id
          in: query
          schema:
            type: string
      responses:
        '200':
          description: A list of payments.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Payment'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /payments/{id}:
    parameters:
      - $ref: '#/components/parameters/Id'
    get:
      operationId: getPayment
      tags: [Payments]
      summary: Retrieve a payment
      responses:
        '200':
          description: The requested payment.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Payment'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /scheduler/session-types:
    get:
      operationId: listSessionTypes
      tags: [Scheduler]
      summary: List bookable session types
      description: >-
        Scheduler is available on Essentials and Premium plans (unlimited
        session types); Starter is capped at one live session type.
      responses:
        '200':
          description: A list of session types.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/SessionType'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /scheduler/bookings:
    get:
      operationId: listBookings
      tags: [Scheduler]
      summary: List scheduled bookings
      responses:
        '200':
          description: A list of bookings.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Booking'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createBooking
      tags: [Scheduler]
      summary: Create a booking against a session type's availability
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BookingInput'
      responses:
        '201':
          description: The created booking.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Booking'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /webhooks:
    get:
      operationId: listWebhooks
      tags: [Webhooks]
      summary: List webhook subscriptions
      description: >-
        Not a confirmed HoneyBook capability - modeled for completeness to
        mirror the five events HoneyBook exposes only as Zapier triggers
        (New Client, New Inquiry, Project Booked, Payment Received, Project
        Stage Changed). No public webhook subscription endpoint is
        documented by HoneyBook.
      responses:
        '200':
          description: A list of webhook subscriptions.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Webhook'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createWebhook
      tags: [Webhooks]
      summary: Subscribe to an event
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/WebhookInput'
      responses:
        '201':
          description: The created webhook subscription.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Webhook'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /webhooks/{id}:
    parameters:
      - $ref: '#/components/parameters/Id'
    delete:
      operationId: deleteWebhook
      tags: [Webhooks]
      summary: Delete a webhook subscription
      responses:
        '200':
          description: Deletion confirmation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DeleteResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  securitySchemes:
    oauth2:
      type: oauth2
      description: >-
        Third-party integration guides reference OAuth 2.0 against
        api.honeybook.com, but are inconsistent on the exact token endpoint
        and grant type and are not independently verifiable. Modeled here as
        an authorization-code flow with refresh tokens, the most common
        pattern for a user-data platform of this kind; treat as unverified.
      flows:
        authorizationCode:
          authorizationUrl: https://api.honeybook.com/oauth/authorize
          tokenUrl: https://api.honeybook.com/oauth/token
          scopes:
            clients.read: Read clients and inquiries.
            clients.write: Create and update clients and inquiries.
            projects.read: Read projects and pipeline stage.
            projects.write: Create and update projects.
            contracts.read: Read contracts.
            contracts.write: Create contracts.
            proposals.read: Read proposals.
            proposals.write: Create proposals.
            invoices.read: Read invoices.
            invoices.write: Create invoices.
            payments.read: Read payments.
            scheduler.read: Read session types and bookings.
            scheduler.write: Create bookings.
            webhooks.write: Manage webhook subscriptions.
  parameters:
    Id:
      name: id
      in: path
      required: true
      description: The unique identifier of the resource.
      schema:
        type: string
    ProjectId:
      name: project_id
      in: path
      required: true
      description: The unique identifier of the parent project.
      schema:
        type: string
  responses:
    Unauthorized:
      description: Missing or invalid access token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    ValidationError:
      description: The request payload failed validation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
    DeleteResponse:
      type: object
      properties:
        id:
          type: string
        deleted:
          type: boolean
    ClientInput:
      type: object
      required:
        - name
        - email
      properties:
        name:
          type: string
        email:
          type: string
          format: email
        phone:
          type: string
        status:
          type: string
          enum: [inquiry, client]
    Client:
      allOf:
        - $ref: '#/components/schemas/ClientInput'
        - type: object
          properties:
            id:
              type: string
            created_at:
              type: string
              format: date-time
    ProjectInput:
      type: object
      required:
        - name
        - client_id
      properties:
        name:
          type: string
        client_id:
          type: string
        stage:
          type: string
          description: Pipeline stage, e.g. Inquiry, Booked, Completed.
    Project:
      allOf:
        - $ref: '#/components/schemas/ProjectInput'
        - type: object
          properties:
            id:
              type: string
            booked:
              type: boolean
            booked_at:
              type: string
              format: date-time
    ContractInput:
      type: object
      required:
        - title
      properties:
        title:
          type: string
        content:
          type: string
    Contract:
      allOf:
        - $ref: '#/components/schemas/ContractInput'
        - type: object
          properties:
            id:
              type: string
            project_id:
              type: string
            status:
              type: string
              enum: [draft, sent, signed]
            signed_at:
              type: string
              format: date-time
    ProposalInput:
      type: object
      required:
        - title
      properties:
        title:
          type: string
        line_items:
          type: array
          items:
            type: object
            properties:
              description:
                type: string
              amount:
                type: number
    Proposal:
      allOf:
        - $ref: '#/components/schemas/ProposalInput'
        - type: object
          properties:
            id:
              type: string
            project_id:
              type: string
            status:
              type: string
              enum: [draft, sent, accepted]
    InvoiceInput:
      type: object
      required:
        - amount_due
      properties:
        amount_due:
          type: number
        due_date:
          type: string
          format: date
        line_items:
          type: array
          items:
            type: object
            properties:
              description:
                type: string
              amount:
                type: number
    Invoice:
      allOf:
        - $ref: '#/components/schemas/InvoiceInput'
        - type: object
          properties:
            id:
              type: string
            project_id:
              type: string
            status:
              type: string
              enum: [draft, sent, paid, overdue]
    Payment:
      type: object
      properties:
        id:
          type: string
        invoice_id:
          type: string
        amount:
          type: number
        method:
          type: string
          enum: [card, ach, manual]
        status:
          type: string
          enum: [succeeded, pending, failed]
        paid_at:
          type: string
          format: date-time
    SessionType:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        duration_minutes:
          type: integer
    BookingInput:
      type: object
      required:
        - session_type_id
        - start_time
      properties:
        session_type_id:
          type: string
        client_id:
          type: string
        start_time:
          type: string
          format: date-time
    Booking:
      allOf:
        - $ref: '#/components/schemas/BookingInput'
        - type: object
          properties:
            id:
              type: string
            status:
              type: string
              enum: [scheduled, cancelled, completed]
    WebhookInput:
      type: object
      required:
        - event
        - target_url
      properties:
        event:
          type: string
          enum:
            - client.created
            - inquiry.created
            - project.booked
            - payment.paid
            - project.stage_changed
        target_url:
          type: string
          format: uri
    Webhook:
      allOf:
        - $ref: '#/components/schemas/WebhookInput'
        - type: object
          properties:
            id:
              type: string