Example feed item extension add

[thokkane]

Could somebody assist in what is the right way to create a site_link_feed_item? I have this code where i pass all the details. I keep getting this error "Concrete sub type of ExtensionFeedItem is required for this operation.", even though the extnesion_type is specified.

Would somebody have a working example? Trial and erroring this is taking a long time.

var feed_item_id = -5
const extensionEntity = [
	{
		entity: 'extension_feed_item',
		operation: 'create',
		resource: {
			resource_name: `customers/${customer_id}/extensionFeedItems/${feed_item_id}`,
			extension_type:enums.ExtensionType.SITELINK, //'Sitelink'
			status: enums.FeedItemSetStatus.ENABLED,
			site_link_feed_item: {
				final_urls: [
					'https://www.google.com'
				],
				"link_text": "test",
				"line1": "great",
				"line2": "stuff",
			},
				"targetedCampaign": `customers/${customer_id}/campaigns/${campaign_id}`,
		}
	}
]
const result2 = await customer.mutateResources(extensionEntity);