VdoCipher API implementation in PHP with adding watermark

vdo_api_annotate.php

<?php
function send($action, $params, $posts = false){
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_FAILONERROR, true);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_VERBOSE, true);
    curl_setopt($curl, CURLOPT_FAILONERROR, false);    

    $getData = http_build_query($params);
    $postData = "clientSecretKey=CLIENT_SECRET_KEY";
	if ($posts) {
		$postData .= "&". $posts;
	}
    curl_setopt($curl, CURLOPT_POST, true); 
    curl_setopt($curl, CURLOPT_POSTFIELDS, $postData);
    $url = "http://api.vdocipher.com/v2/$action/?$getData";
    curl_setopt($curl, CURLOPT_URL,$url);
    $html = curl_exec($curl);
	if (!$html) {
		print_r(curl_error($curl));
		die();
	}
    curl_close($curl);
    return $html;
}

$params = array(
    'video'	=>	'VIDEO_ID'
);
$annoData = "[".
      "{'type':'image', 'url':'https://example.com/url/to/image.jpg', 'alpha':'0.8', 'x':'100','y':'200'},".
      "{'type':'rtext', 'text':'moving text', 'alpha':'0.8', 'color':'0xFF0000', 'size':'12','interval':'5000'},".
      "{'type':'text', 'text':'static text', 'alpha':'0.5' , 'x':'10', 'y':'100', 'co    lor':'0xFF0000', 'size':'12'}".
      "]";

$anno = urlencode($annoData);
$OTP = send("otp", $params, "annotate=". $anno);
$OTP = json_decode($OTP)->otp;
echo <<<EOF
<div id="vdo$OTP" style="height:400px;width:640px;max-width:100%;"></div>
	<script>
	(function(v,i,d,e,o){v[o]=v[o]||{}; v[o].add = v[o].add || function V(a){ (v[o].d=v[o].d||[]).push(a);};
	if(!v[o].l) { v[o].l=1*new Date(); a=i.createElement(d), m=i.getElementsByTagName(d)[0];
	a.async=1; a.src=e; m.parentNode.insertBefore(a,m);}
	})(window,document,'script','//de122v0opjemw.cloudfront.net/vdo.js','vdo');
	vdo.add({
		o: "$OTP",
	});
</script>";
EOF;
?>