What is Webhook?

Also known as: Web hook, Callback URL

Definition

An automatic notification one system sends to another the moment something happens — for example, an Instagram post getting a new comment, or a Stripe payment coming in.

In-depth explanation

Webhooks are the counterpart to API calls: instead of a platform having to "poll" regularly to check whether anything is new, the external system sends a notification itself. This makes real-time automations possible.

For agencies, webhooks usually work in the background — you barely notice them, except that things happen "by themselves". Examples: a new DM on Instagram → appears instantly in the unified inbox; a new payment in Stripe → client status update; a new Calendly booking → straight into the calendar.

Example from agency practice

A client receives a DM on Instagram at 11pm. Meta sends a webhook to Senly. Senly drops the message straight into the unified inbox. The next morning the agency sees it in one list — no digging through 12 platforms.

Especially relevant for

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