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POST
/
marketing
/
marketing-events
/
2026-03
/
events
/
{externalEventId}
/
{subscriberState}
/
upsert
cURL
curl --request POST \
  --url https://api.hubapi.com/marketing/marketing-events/2026-03/events/{externalEventId}/{subscriberState}/upsert \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputs": [
    {
      "interactionDateTime": 123,
      "properties": {},
      "vid": 123
    }
  ]
}
'
{
  "message": "Invalid input (details will vary based on the error)",
  "correlationId": "aeb5f871-7f07-4993-9211-075dc63e7cbf",
  "category": "VALIDATION_ERROR",
  "links": {
    "knowledge-base": "https://www.hubspot.com/products/service/knowledge-base"
  }
}

Supported products

Authorizations

​
Authorization
string
header
required

The access token received from the authorization server in the OAuth 2.0 flow.

Path Parameters

​
externalEventId
string
required
​
subscriberState
string
required

Query Parameters

​
externalAccountId
string
required

Body

application/json
​
inputs
object[]
required

List of HubSpot contacts to subscribe to the marketing event

Response

default - */*
​
category
string
required

The error category

​
correlationId
string<uuid>
required

A unique identifier for the request. Include this value with any error reports or support tickets

Example:

"aeb5f871-7f07-4993-9211-075dc63e7cbf"

​
message
string
required

A human readable message describing the error along with remediation steps where appropriate

Example:

"An error occurred"

​
context
object

Context about the error condition

Example:

"{invalidPropertyName=[propertyValue], missingScopes=[scope1, scope2]}"

​
errors
object[]

further information about the error

​
links
object

A map of link names to associated URIs containing documentation about the error or recommended remediation steps

​
subCategory
string

A specific category that contains more specific detail about the error

Last modified on April 1, 2026