> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sequenzy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Preview Default Footer

> Review affected emails and rendered HTML before applying your default footer.

You can preview a footer update without saving it. Send `blocks` (a nonempty email
block array), optional `name` and nullable `description`, and required `application`
with `scopes` and optional `includeCustomized`. An empty scope array previews only
the default. The supported slot is `footer`.

```json theme={null}
{
  "blocks": [
    {
      "type": "footer",
      "variant": "full",
      "companyName": "Acme",
      "address": "123 Main Street"
    }
  ],
  "application": {
    "scopes": ["sequences", "campaigns"],
    "includeCustomized": false
  },
  "renderPreview": true
}
```

The `200` response includes `success`, `application.token`, `application.counts`,
`application.affected`, and `application.skipped`. Each item has `scope`, `kind`,
`id`, and `name`; skipped items also have `reason`. With `renderPreview: true`,
`renderedPreview` contains `footerHtml`, `samples` with `beforeHtml` and `afterHtml`,
and a preview limitation `note`. By default you receive up to one sample per selected
category. Supply `sample: { id, kind }` for a particular affected email version.

Personal keys require workspace admin access. Keys need `emails:write`, selected
category write scopes, and `ab_tests:write` for sequences or campaigns, matching
application permissions. Invalid blocks or slots return `400`, invalid credentials
return `401`, missing permissions return `403`.
Malformed request shapes, such as missing required fields or invalid scope values,
return `422`. Unexpected rendering or database failures return `500`; transient database
unavailability may return `503`.

Apply with [Set Default Email Component](/api-reference/email-components/set-default)
using identical inputs and `previewToken`. Preview does not modify content or send emails.