by Payam Fz
Generates the HMAC SHA256 cryptography signature which can be used for web requests, secure messaging, etc.
▫️message: the message to be authenticated
▫️key: the secret key
* These variables are set to "The brown fox..." and "key" inside flow for demonstration purposes. Set your desired values instead.
▫️sign: the final hmac sha256 signature to be used
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