Webhook
A platform-to-you HTTP callback that fires when something happens, so your systems stay current without polling.
Instead of your integration asking "anything new?" on a timer, webhooks push events — artwork updated, invoice paid — to a URL you provide, signed so you can verify the sender.
For galleries this is how a custom website stays current or an internal tool reacts to sales the moment they happen.
In the product: API & Developers. Related: Idempotency (API)