> ## Documentation Index
> Fetch the complete documentation index at: https://voucherify-pw-further-tests.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Update Custom Event Schema

> Updates a custom event schema.

With this request, you can:
- Add a nonexistent property to a custom event schema.
- Update an existing property.

In the request, you can provide only those properties you want to add or update. Definitions omitted in the request remain unchanged.

> 👍 Additional Notes
>
>- You can change the type of an existing property, e.g. from `"string"` to `"number"`.
>
>- You can remove a custom property with this endpoint by providing `"deleted": true` in the request. However, you cannot permanently remove an event definition or its property with this endpoint.

> 📘 Custom Event Documentation
>
> Read [Custom Events](https://support.voucherify.io/article/111-custom-events) article to learn how custom events work in Voucherify.
>
>Read also the details about the [Track Custom Event](ref:track-custom-event) endpoint and the [Custom Event Object](ref:custom-event-object).