src/Api/Signature.php
public static function isValid($sign, $messageBody, $token)
    {
        return hash_equals($sign, self::make($messageBody, $token));
    }
public static function isValid($sign, $messageBody, $token)
    {
        return hash_equals($sign, self::make($messageBody, $token));
    }
public static function isValid ( $ sign , $ messageBody , $ token ) { return hash_equals ( $ sign , self :: make ( $ messageBody , $ token ) ) ; }
Is message signatore valid?

@param  string  $sign        from request headers
@param  string  $messageBody from request body
@param  string  $token       bot access token
@return boolean              valid or not
Is message signatore valid?