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A cryptographic proof that a webhook came from the service that claims to send it.
Webhook signatures prevent attackers from faking payment, auth, or automation events. Always verify the signature before trusting a webhook body.
Plainly
Think of Webhook Signature as the lock and rules that keep people and data safe. A cryptographic proof that a webhook came from the service that claims to send it.
In practice
Use it when a workflow touches secrets, permissions, user data, payments, or untrusted input. In practice, define the owner, input, output, and failure mode before you rely on it.