---
title: "Contact Custom Field Value Changed Webhook"
method: POST
path: "contact.custom-field.value_changed"
---

# Contact Custom Field Value Changed Webhook

`POST contact.custom-field.value_changed` (webhook)

Triggered when a custom field value is modified for a contact record.

**Payload includes:**
* Custom field's unique identifier
* Updated field value
* Modification timestamp
* User reference who made the change

The event payload contains both the modified custom field data and webhook event metadata for comprehensive tracking and processing.

## Payload

- ContactCustomFieldValueChangedEvent
  - `eventDateTime` string, date-time
  - `eventId` string, uuid
  - `subscriptionId` string, uuid
  - `topicName` string
  - `event` object
    - `contact` object
      - `id` string, uuid
      - `_link` string, uri
      - `customField` ContactCustomFieldValueChanged
        - `id` string, uuid
        - `_link` string, uri
        - `modifiedBy` ChangedByLink
          - `id` string, uuid
          - `_link` string, uri
        - `modifiedDate` string, date-time
        - `values` string[]: Unformatted values of the custom field.
        - `formattedValues` string[]: Formatted values of the custom field.

## Acknowledgement `204`

The webhook was received successfully.

## Other responses

- `400`: Bad Request - The server cannot process the request due to a client error. Common causes: - Invalid request format - Missing required fields - Validation errors in the request data
- `401`: Unauthorized - Authentication is required or has failed. Common causes: - Missing API key - Invalid API key - Expired or deactivated API key
- `404`: Not Found - The requested resource does not exist. Common causes: - Invalid subscription ID - Subscription has been deleted - URL path contains typos or incorrect values

---

[API](https://skmtc.dev/acculynx/apis/webhooks-api.md) - [All operations](https://skmtc.dev/acculynx/apis/webhooks-api/llms.txt) - [OpenAPI document](https://skmtc.dev/acculynx/apis/webhooks-api/revisions/8bc7679859d8?raw)