Metadata specific to YouTube links.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v24/resources/data_link.proto)

| Fields ||
|---|---|
| ## `brand_channel_id` | `string` Immutable. The ID of a YouTube brand channel to help creators understand your brand. The channel must be linked to this account. This is a string value with "UC" prefix. For example, "UCK8sQmJBp8GCxrOtXWBpyEA". |