$options = array(
CURLOPT_HEADER => false,
CURLOPT_HTTPHEADER => array("Client-ID: xxxxxx"),
CURLOPT_HTTPHEADER => array("Authorization: Bearer xxxxxx"),
);
should be
$options = array(
CURLOPT_HEADER => false,
CURLOPT_HTTPHEADER => array(
"Client-ID: xxxxxx",
"Authorization: Bearer xxxxxx"
),
);