Standard Webhooks 1.0.0 (via) A loose specification for implementing webhooks, put together by a technical steering committee that includes representatives from Zapier, Twilio and more.
These recommendations look great to me. Even if you don’t follow them precisely, this document is still worth reviewing any time you consider implementing webhooks—it covers a bunch of non-obvious challenges, such as responsible retry scheduling, thin-vs-thick hook payloads, authentication, custom HTTP headers and protecting against Server side request forgery attacks.
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