How to properly create and secure Nylas API webhooks using HTTP and CLI

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Nylas webhooks allow apps to receive real-time email and calendar event notifications without polling, by registering a URL that Nylas pushes updates to. Setting one up correctly requires three steps: passing a challenge verification, securely storing a one-time signing secret, and validating a signature on every incoming delivery to prevent spoofed requests. Developers can register webhooks via a POST request to the Nylas API or through the Nylas CLI using commands like nylas webhook create, with trigger types and a destination URL as required inputs. Before a webhook goes live, Nylas sends a GET request with a challenge parameter that the endpoint must echo back within 10 seconds to activate. The CLI also supports the full webhook lifecycle — listing, viewing, updating, and deleting webhooks — making it useful for managing integrations across environments without writing custom requests.

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