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It is recommended to validate incoming webhook requests to ensure that they originate from OnlyFans API, and not from a malicious actor. You can do this by verifying the Signature header in the request.
You can choose any signing secret, but it is recommended to use a long, random string.

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How the signature is calculated

We calculate the signature using the HMAC SHA256 algorithm. The payload (as json) is the string, and the signing secret is the key.

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Verifying the signature

Below you can find examples of how to verify the signature in different programming languages. 
$computedSignature = hash_hmac('sha256', $requestContent, $signingSecret);