apiKeyId property

The globally unique, Google-assigned identifier (UID) for the Firebase API key associated with the IosApp.

Be aware that this value is the UID of the API key, not the [keyString](https://cloud.google.com/api-keys/docs/reference/rest/v2/projects.locations.keys#Key.FIELDS.key_string) of the API key. The keyString is the value that can be found in the App's [configuration artifact](../../rest/v1beta1/projects.iosApps/getConfig). If api_key_id is not set in requests to [iosApps.Create](../../rest/v1beta1/projects.iosApps/create), then Firebase automatically associates an api_key_id with the IosApp. This auto-associated key may be an existing valid key or, if no valid key exists, a new one will be provisioned. In patch requests, api_key_id cannot be set to an empty value, and the new UID must have no restrictions or only have restrictions that are valid for the associated IosApp. We recommend using the Google Cloud Console to manage API keys.