HubSpot: Record Participants by Contact Id with Marketing Event Object Id

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Operation hubspot.marketing_events_attendance_create

Provider route: POST /marketing/marketing-events/2026-09/{objectId}/attendance/{subscriberState}/create. Alter supplies the connection’s credentials and routing.

Call through Alter

Install @alter-ai/sdk @alter-ai/hubspot with npm, or alter-sdk-hubspot with pip. Supply your connected customer’s grant ID and the arguments described below.

import { App } from "@alter-ai/sdk";
import { HubSpotIntegration } from "@alter-ai/hubspot";

async function execute(input: Parameters<HubSpotIntegration["marketingEvents"]["attendanceCreate"]>[0]) {
  const app = new App({ apiKey: process.env.ALTER_API_KEY! });
  try {
    const provider = new HubSpotIntegration(app, { grantId: process.env.PROVIDER_GRANT_ID! });
    const call = await provider.marketingEvents.attendanceCreate(input);
    const result = await call.wait();
    return result.bodyJson();
  } finally {
    await app.close();
  }
}

import os
from alter_sdk import App
from alter_sdk_hubspot import HubSpotIntegration

async def execute(arguments):
    async with App(api_key=os.environ["ALTER_API_KEY"]) as app:
        provider = HubSpotIntegration(app, {"grant_id": os.environ["PROVIDER_GRANT_ID"]})
        call = await provider.marketing_events.attendance_create(arguments)
        result = await call.wait()
        return result.body_json()

Input

Field	Type	Presence	Description and constraints
$	object	Root	Additional keys: not allowed
path	object	Required within parent	Additional keys: not allowed
path.objectId	string	Required within parent
path.subscriberState	string	Required within parent
body	Model	Required within parent	Expand Record a subscriber state by contact ID — request body — body

Referenced models: Record a subscriber state by contact ID — request body — body

Response

Response media type: application/json. The table describes the pinned successful response. Referenced models link to their complete fields.

Field	Type	Presence	Description and constraints
$	Model	Root	Expand Record Participants by Contact Id with Marketing Event Object Id — response body

Referenced models: Record Participants by Contact Id with Marketing Event Object Id — response body

Schemas

Record a subscriber state by contact ID — request body — body

Field	Type	Presence	Description and constraints
$	object	Root
inputs	array	Required within parent	List of HubSpot contacts to subscribe to the marketing event
inputs[]	Model	Each item	Expand Record a subscriber state by contact ID — request body — body inputs item

Referenced models: Record a subscriber state by contact ID — request body — body inputs item

Record Participants by Contact Id with Marketing Event Object Id — response body

Field	Type	Presence	Description and constraints
$	object	Root
completedAt	string	Required within parent	Timestamp that represents when the request finished processing Format: date-time
errors	array	Optional	An array of StandardError objects, each detailing an error encountered during the batch operation.
errors[]	Model	Each item	Expand Create or Update Multiple Marketing Events — response body — errors item
links	object	Optional	Result of the request Additional keys: see wildcard field
links.*	string	Additional keys
numErrors	JSON	Optional
numErrors (anyOf 1)	integer	Alternative	The number of errors that occurred during the processing Format: int32
numErrors (anyOf 2)	string	Alternative	Pattern: ^-?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?$
requestedAt	string	Optional	Timestamp that represents when the request was made Format: date-time
results	array	Required within parent	An array of SubscriberVidResponse objects, each representing the result of processing an individual subscriber VID.
results[]	Model	Each item	Expand Record Participants by Contact Id with Marketing Event Object Id — response body — results item
startedAt	string	Required within parent	Timestamp that represents when the request started processing Format: date-time
status	string	Required within parent	The status of the request processing Known values: CANCELED, COMPLETE, PENDING, PROCESSING

Referenced models: Create or Update Multiple Marketing Events — response body — errors item, Record Participants by Contact Id with Marketing Event Object Id — response body — results item

Record a subscriber state by contact ID — request body — body inputs item

Field	Type	Presence	Description and constraints
$	object	Root
interactionDateTime	integer	Required within parent	Timestamp in milliseconds at which the contact subscribed to the event. Format: int64
properties	object	Required within parent	The key-value set of the properties of the contact Additional keys: see wildcard field
properties.*	string	Additional keys
vid	integer	Required within parent	The ID of the contact in HubSpot Format: int64

Create or Update Multiple Marketing Events — response body — errors item

Field	Type	Presence	Description and constraints
$	object	Root	Ye olde error
category	string	Required within parent	The category of the error
context	object	Required within parent	The object that contains details of the errors Additional keys: see wildcard field
context.*	array	Additional keys
context.*[]	string	Each item
errors	array	Required within parent	An array of ErrorDetail objects providing further information about the error.
errors[]	Model	Each item	Expand Batch insert events — response body — errors item errors item
id	string	Optional	The ID of the request
links	object	Required within parent	Results of the request Additional keys: see wildcard field
links.*	string	Additional keys
message	string	Required within parent	A human readable message describing the error along with remediation steps where appropriate
status	string	Required within parent	Status of the response
subCategory	object	Optional	The Sub-category of the error

Referenced models: Batch insert events — response body — errors item errors item

Record Participants by Contact Id with Marketing Event Object Id — response body — results item

Field	Type	Presence	Description and constraints
$	object	Root
vid	JSON	Required within parent
vid (anyOf 1)	integer	Alternative	The internal ID of the contact Format: int64
vid (anyOf 2)	string	Alternative	Pattern: ^-?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?$

Batch insert events — response body — errors item errors item

Field	Type	Presence	Description and constraints
$	object	Root	Represents detailed information about an error that occurred in the API. This component is used to provide additional context and specifics about errors, typically as part of an error response.
code	string	Optional	The status code associated with the error detail
context	object	Optional	Context about the error condition Additional keys: see wildcard field
context.*	array	Additional keys
context.*[]	string	Each item
in	string	Optional	The name of the field or parameter in which the error was found.
message	string	Required within parent	A human readable message describing the error along with remediation steps where appropriate
subCategory	string	Optional	A specific category that contains more specific detail about the error

Policy, approvals and errors

SDK function policy ID: hubspot.marketing_events_attendance_create. Catalog operation: marketing_events_attendance_create. Rules can name either ID; function rules distinguish managed calls and conservatively cover raw calls sharing the route. Existing grant permissions and policy rules apply. wait() returns an immediate result or waits for a required approval; it never approves the request itself. Persist the approval ID to resume after a restart.

Provider errors retain their response; JSON decoding raises ProviderAPIError for provider failures. ManagedOperationError identifies contract/input/retention errors. See error handling and provider-specific behavior. Sensitive input may be refused before approval storage. A decoding error never resubmits a write.

Required provider scopes: ["crm.objects.marketing_events.write"]

Official provider source