Webhook Payload Verifier in Elixir/Phoenix

So I’ve been trying to verify notification payload in Elixir/Phoenix.
I read Twich Webhook Guide, what is implied following “notification_bytes” ?

The X-Hub-Signature header is generated by sha256(secret, notification_bytes).

Is this mean “data byte_size” ?
e.g. )


I will use Erlang crypto or Plug crypto.

I’ve just solved problem by myself.

I parsed JSON wrong order.

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