Queue a re-read of the collection's contract-level metadata, such as the name, description and image from contractURI(). Items with missing metadata are refetched too; to refresh one item use POST /api/v2/chain/{chain}/contract/{address}/nfts/{identifier}/refresh. The refresh runs in the background, so GET /api/v2/collections/{slug} shows the result after it finishes. Only the collection owner or an authorized editor can request it.