Flo commented on create webhook via API (Required parameter missing or invalid)

Okay. Fixed it myself.

I was not aware that i had to create

        $payload = array('webhook' => array('topic'     => $event,'address'   => $address,'format'    => $format
                    )
        );

instead of 

        $payload = array('topic'     => $event,'address'   => $address,'format'    => $format
                    );