# Custom Data (WebChat)

WebChat webhook payloads can include optional custom data for additional attribution or tracking information. To provide custom data, implement the `aktifyCustomDataForWebhook` function in your webpage where WebChat is installed.

## Limits

| Constraint | Limit |
| :--- | :--- |
| Maximum key-value pairs | 20 |
| Maximum key length | 256 characters |
| Maximum value length | 4,096 characters |
| Key and value types | Strings only |

:::warning
If these limits are exceeded, a warning will be logged to the browser console and the custom data will be stripped from the webhook payload.
:::