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Compute signature of a http from Hoiio. This is used to authenticate the notification from Hoiio. Match this computed signature with the HTTP header "X-Hoiio-Signature".
<?php
function computeHoiioSignature($payload, $accessToken) {
// hash_hmac will return a hex of the digest
$signature =hash_hmac('sha256', $payload, $accessToken);
return $signature;
}
?>
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