HubSpot Marketing Events API

openapi: 3.0.1
info:
  title: HubSpot Marketing Events
  description: Basepom for all HubSpot Projects
  version: 2026-09
  x-hubspot-product-tier-requirements:
    marketing: FREE
    sales: FREE
    service: FREE
    cms: FREE
    commerce: FREE
    crmHub: FREE
    dataHub: FREE
servers:
- url: https://api.hubapi.com
tags:
- name: Basic
- name: Batch
- name: Event Attendees
- name: Event Status
- name: Identifiers
- name: List Associations
- name: Participant State
- name: Settings
- name: Subscriber State Changes
paths:
  /marketing/marketing-events/2026-09:
    get:
      tags:
      - Basic
      operationId: get-/marketing/marketing-events/2026-09_/marketing/marketing-events/v3
      parameters:
      - name: after
        in: query
        description: The cursor indicating the position of the last retrieved item.
        required: false
        style: form
        explode: true
        schema:
          type: string
      - name: limit
        in: query
        description: The limit for response size. The default value is 10, the max number is 100
        required: false
        style: form
        explode: true
        schema:
          type: integer
          format: int32
          default: 10
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CollectionResponseMarketingEventPublicReadResponseV2ForwardPaging'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.read
  /marketing/marketing-events/2026-09/associations/{externalAccountId}/{externalEventId}/lists:
    get:
      tags:
      - List Associations
      summary: Get lists associated with a marketing event
      description: Gets lists associated with a marketing event by external account id and external event
        id
      operationId: get-/marketing/marketing-events/2026-09/associations/{externalAccountId}/{externalEventId}/lists_getAllByExternalAccountAndEventIds
      parameters:
      - name: externalAccountId
        in: path
        description: The accountId that is associated with this marketing event in the external event
          application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalEventId
        in: path
        description: The id of the marketing event in the external event application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CollectionResponseWithTotalPublicList'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/associations/{externalAccountId}/{externalEventId}/lists/{listId}:
    put:
      tags:
      - List Associations
      summary: Associate a list with a marketing event
      description: Associates a list with a marketing event by external account id, external event id,
        and ILS list id
      operationId: put-/marketing/marketing-events/2026-09/associations/{externalAccountId}/{externalEventId}/lists/{listId}_associateByExternalAccountAndEventIds
      parameters:
      - name: externalAccountId
        in: path
        description: The accountId that is associated with this marketing event in the external event
          application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalEventId
        in: path
        description: The id of the marketing event in the external event application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: listId
        in: path
        description: The ILS ID of the list.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      responses:
        '204':
          description: No content
          content: {}
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
    delete:
      tags:
      - List Associations
      summary: Disassociate a list from a marketing event
      description: Disassociates a list from a marketing event by external account id, external event
        id, and ILS list id
      operationId: delete-/marketing/marketing-events/2026-09/associations/{externalAccountId}/{externalEventId}/lists/{listId}_disassociateByExternalAccountAndEventIds
      parameters:
      - name: externalAccountId
        in: path
        description: The accountId that is associated with this marketing event in the external event
          application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalEventId
        in: path
        description: The id of the marketing event in the external event application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: listId
        in: path
        description: The ILS ID of the list.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      responses:
        '204':
          description: No content
          content: {}
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/associations/{marketingEventId}/lists:
    get:
      tags:
      - List Associations
      summary: Get lists associated with a marketing event
      description: Gets lists associated with a marketing event by marketing event id
      operationId: get-/marketing/marketing-events/2026-09/associations/{marketingEventId}/lists_getAllByMarketingEventId
      parameters:
      - name: marketingEventId
        in: path
        description: The internal id of the marketing event in HubSpot.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CollectionResponseWithTotalPublicList'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/associations/{marketingEventId}/lists/{listId}:
    put:
      tags:
      - List Associations
      summary: Associate a list with a marketing event
      description: Associates a list with a marketing event by marketing event id and ILS list id
      operationId: put-/marketing/marketing-events/2026-09/associations/{marketingEventId}/lists/{listId}_associateByMarketingEventId
      parameters:
      - name: listId
        in: path
        description: The ILS ID of the list.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: marketingEventId
        in: path
        description: The internal id of the marketing event in HubSpot.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      responses:
        '204':
          description: No content
          content: {}
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
    delete:
      tags:
      - List Associations
      summary: Disassociate a list from a marketing event
      description: Disassociates a list from a marketing event by marketing event id and ILS list id
      operationId: delete-/marketing/marketing-events/2026-09/associations/{marketingEventId}/lists/{listId}_disassociateByMarketingEventId
      parameters:
      - name: listId
        in: path
        description: The ILS ID of the list.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: marketingEventId
        in: path
        description: The internal id of the marketing event in HubSpot.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      responses:
        '204':
          description: No content
          content: {}
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/attendance/{externalEventId}/{subscriberState}/create:
    post:
      tags:
      - Event Attendees
      summary: Record Participants by ContactId with Marketing Event External Ids
      description: 'Records the participation of multiple HubSpot contacts in a Marketing Event using
        their HubSpot contact IDs.


        Additional Functionality:

        - Adds a timeline event to the contacts.


        Allowed Properties:

        For the state "attend":

        - joinedAt

        - leftAt'
      operationId: post-/marketing/marketing-events/2026-09/attendance/{externalEventId}/{subscriberState}/create_recordByContactIds
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: subscriberState
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: false
        style: form
        explode: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventSubscriber'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BatchResponseSubscriberVidResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/attendance/{externalEventId}/{subscriberState}/email-create:
    post:
      tags:
      - Event Attendees
      summary: Record Participants by Email with Marketing Event External Ids
      description: 'Records the participation of multiple HubSpot contacts in a Marketing Event using
        their email addresses.


        If a contact does not exist, it will be automatically created. The contactProperties field is
        used exclusively for creating new contacts and will not update properties of existing contacts.


        Additional Functionality:

        - Adds a timeline event to the contacts.


        Allowed Properties:

        For the state "attend":

        - joinedAt

        - leftAt'
      operationId: post-/marketing/marketing-events/2026-09/attendance/{externalEventId}/{subscriberState}/email-create_recordByContactEmails
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: subscriberState
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: false
        style: form
        explode: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventEmailSubscriber'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BatchResponseSubscriberEmailResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/batch/archive:
    post:
      tags:
      - Batch
      summary: Delete Multiple Marketing Events by ObjectId
      description: 'Deletes multiple Marketing Events from the portal based on their objectId, if they
        exist.


        Responses:

        204: Returned if all specified Marketing Events were successfully deleted.

        207: Returned if some objectIds did not correspond to any existing Marketing Events.'
      operationId: post-/marketing/marketing-events/2026-09/batch/archive_archiveByObjectId
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventPublicObjectIdDeleteRequest'
        required: true
      responses:
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/batch/update:
    post:
      tags:
      - Batch
      summary: Update Multiple Marketing Events by ObjectId
      description: Updates multiple Marketing Events on the portal based on their objectId, if they exist.
      operationId: post-/marketing/marketing-events/2026-09/batch/update_updateByObjectId
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventPublicUpdateRequestFullV2'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BatchResponseMarketingEventPublicDefaultResponseV2'
        '207':
          description: multiple statuses
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BatchResponseMarketingEventPublicDefaultResponseV2WithErrors'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events:
    post:
      tags:
      - Basic
      summary: Create a marketing event
      description: Creates a new marketing event in HubSpot
      operationId: post-/marketing/marketing-events/2026-09/events_create
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MarketingEventCreateRequestParams'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MarketingEventDefaultResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events/delete:
    post:
      tags:
      - Batch
      summary: Delete Multiple Marketing Events by External Ids
      description: 'Deletes multiple Marketing Events based on externalAccountId, externalEventId, and
        appId.


        Only Marketing Events created by the same apps will be deleted; events from other apps cannot
        be removed by this endpoint. '
      operationId: post-/marketing/marketing-events/2026-09/events/delete_archive
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventExternalUniqueIdentifier'
        required: true
      responses:
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events/search:
    get:
      tags:
      - Identifiers
      summary: Find App-Specific Marketing Events by External Event Id
      description: 'Retrieves Marketing Events where the externalEventId matches the value provided in
        the request, limited to events created by the app making the request.


        Marketing Events created by other apps will not be included in the results.'
      operationId: get-/marketing/marketing-events/2026-09/events/search_doSearch
      parameters:
      - name: q
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CollectionResponseSearchPublicResponseWrapperNoPaging'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.read
  /marketing/marketing-events/2026-09/events/upsert:
    post:
      tags:
      - Batch
      summary: Create or Update Multiple Marketing Events
      description: 'Upserts multiple Marketing Events. If a Marketing Event with the specified ID already
        exists, it will be updated; otherwise, a new event will be created.


        Only Marketing Events originally created by the same app can be updated.'
      operationId: post-/marketing/marketing-events/2026-09/events/upsert_upsert
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventCreateRequestParams'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BatchResponseMarketingEventPublicDefaultResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events/{externalEventId}:
    get:
      tags:
      - Basic
      summary: Get Marketing Event by External IDs
      description: 'Returns the details of a Marketing Event with the specified externalAccountId, externalEventId,
        if it exists.


        Only Marketing Events created by the same app making the request can be retrieved.'
      operationId: get-/marketing/marketing-events/2026-09/events/{externalEventId}_getDetails
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MarketingEventPublicReadResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.read
    put:
      tags:
      - Basic
      summary: Create or update a marketing event
      description: Upserts a marketing event If there is an existing marketing event with the specified
        ID, it will be updated; otherwise a new event will be created.
      operationId: put-/marketing/marketing-events/2026-09/events/{externalEventId}_upsert
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MarketingEventCreateRequestParams'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MarketingEventPublicDefaultResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
    delete:
      tags:
      - Basic
      summary: Delete Marketing Event by External Ids
      description: 'Deletes the existing Marketing Event with the specified externalAccountId, externalEventId,
        if it exists.


        Only Marketing Events created by the same app can be deleted.'
      operationId: delete-/marketing/marketing-events/2026-09/events/{externalEventId}_archive
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      responses:
        '204':
          description: No content
          content: {}
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
    patch:
      tags:
      - Basic
      summary: Update Marketing Event by External IDs
      description: 'Updates the details of an existing Marketing Event identified by its externalAccountId,
        externalEventId if it exists.


        Only Marketing Events created by the same app can be updated.'
      operationId: patch-/marketing/marketing-events/2026-09/events/{externalEventId}_update
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MarketingEventUpdateRequestParams'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MarketingEventPublicDefaultResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events/{externalEventId}/cancel:
    post:
      tags:
      - Event Status
      summary: Mark a marketing event as cancelled
      description: Mark a marketing event as cancelled.
      operationId: post-/marketing/marketing-events/2026-09/events/{externalEventId}/cancel_cancel
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MarketingEventDefaultResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events/{externalEventId}/complete:
    post:
      tags:
      - Event Status
      summary: Mark a marketing event as completed
      description: Mark a marketing event as completed
      operationId: post-/marketing/marketing-events/2026-09/events/{externalEventId}/complete_complete
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MarketingEventCompleteRequestParams'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MarketingEventDefaultResponse'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events/{externalEventId}/{subscriberState}/email-upsert:
    post:
      tags:
      - Subscriber State Changes
      summary: Record a subscriber state by contact email
      description: 'Record a subscriber state between multiple HubSpot contacts and a marketing event,
        using contact email addresses. Note that the contact must already exist in HubSpot; a contact
        will not be created. The contactProperties field is used only when creating a new contact. These
        properties will not update existing contacts. '
      operationId: post-/marketing/marketing-events/2026-09/events/{externalEventId}/{subscriberState}/email-upsert_upsertByContactEmail
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: subscriberState
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventEmailSubscriber'
        required: true
      responses:
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/events/{externalEventId}/{subscriberState}/upsert:
    post:
      tags:
      - Subscriber State Changes
      summary: Record a subscriber state by contact ID
      description: Record a subscriber state between multiple HubSpot contacts and a marketing event,
        using HubSpot contact IDs. Note that the contact must already exist in HubSpot; a contact will
        not be created.
      operationId: post-/marketing/marketing-events/2026-09/events/{externalEventId}/{subscriberState}/upsert_upsertByContactId
      parameters:
      - name: externalEventId
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: subscriberState
        in: path
        description: ''
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalAccountId
        in: query
        description: ''
        required: true
        style: form
        explode: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BatchInputMarketingEventSubscriber'
        required: true
      responses:
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.write
  /marketing/marketing-events/2026-09/participations/contacts/{contactIdentifier}/breakdown:
    get:
      tags:
      - Participant State
      summary: Read participations breakdown by Contact identifier
      description: Read Contact's participations by identifier - email or internal id.
      operationId: get-/marketing/marketing-events/2026-09/participations/contacts/{contactIdentifier}/breakdown_getParticipationsBreakdownByContactId
      parameters:
      - name: contactIdentifier
        in: path
        description: The identifier of the Contact. It may be email or internal id.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: after
        in: query
        description: The cursor indicating the position of the last retrieved item.
        required: false
        style: form
        explode: true
        schema:
          type: string
      - name: limit
        in: query
        description: The limit for response size. The default value is 10, the max number is 100
        required: false
        style: form
        explode: true
        schema:
          type: integer
          format: int32
          default: 10
      - name: state
        in: query
        description: The participation state value. It may be REGISTERED, CANCELLED, ATTENDED, NO_SHOW
        required: false
        style: form
        explode: true
        schema:
          type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CollectionResponseWithTotalParticipationBreakdown'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.read
  /marketing/marketing-events/2026-09/participations/{externalAccountId}/{externalEventId}:
    get:
      tags:
      - Participant State
      summary: Read participations counters by Marketing Event external identifier
      description: Read Marketing event's participations counters by externalAccountId and externalEventId
        pair.
      operationId: get-/marketing/marketing-events/2026-09/participations/{externalAccountId}/{externalEventId}_getParticipationsCountersByEventExternalId
      parameters:
      - name: externalAccountId
        in: path
        description: The accountId that is associated with this marketing event in the external event
          application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      - name: externalEventId
        in: path
        description: The id of the marketing event in the external event application.
        required: true
        style: simple
        explode: false
        schema:
          type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AttendanceCounters'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - crm.objects.marketing_events.read
  /marketing/marketing-events/2026-09/participations/{externalAccountId}/{externalEventId}/breakdown:
    get:
      tags:
      - Participant State
      summary

# --- truncated at 32 KB (100 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/hubspot/refs/heads/main/openapi/hubspot-marketing-marketing-events-api-openapi.yml