<?php
$data = "1234"; //Ganti dengan consumerID dari BPJS
$secretKey = "5678"; //Ganti dengan consumerSecret dari BPJS
$url = "http://api.asterix.co.id/SepWebRest/peserta/nik/";  //Lihat katalog
$nik = "3302014525481245";  //ganti dengan NIK (nomor KTP)

date_default_timezone_set('UTC');
$tStamp = strval(time()-strtotime('1970-01-01 00:00:00'));
$signature = hash_hmac('sha256', $data."&".$tStamp, $secretKey, true);
$encodedSignature = base64_encode($signature);
$urlencodedSignature = urlencode($encodedSignature);

echo "X-cons-id: " .$data ."<br>";
echo "X-timestamp:" .$tStamp ."<br>";
echo "X-signature: " .$encodedSignature."<br>";

$opts = array(
 'http'=>array(
 'method'=>"GET",
 'header'=>"Host: api.asterix.co.id\r\n".
 "Connection: close\r\n".
 "X-timestamp: ".$tStamp."\r\n".
 "X-signature: ".$encodedSignature."\r\n".
 "User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64)\r\n".
 "X-cons-id: ".$data."\r\n".
 "Accept: application/json\r\n"
 )
);

$context = stream_context_create($opts);

$result = file_get_contents($url.$nik, false, $context);
echo "<br>Respon:";
if ($result === false) 
{ 
 echo "Tidak dapat menyambung ke server"; 
} else { 
 $resultarr=json_decode($result, true);
 $s=$resultarr['response']['start'];
 $l=$resultarr['response']['limit'];
 $c=$resultarr['response']['count'];
 
 echo "<br>Ditemukan ".$c." data, tampil mulai dari nomor ".$s." hingga nomor ".$l."<br>";
 for($i=0;$i<$c;$i++){
     echo "<h1>Nama: ".$resultarr['response']['list'][$i]['nama']."</h1>";
 }
 
 echo "<pre>";
 //print_r($resultarr['response']); 
 echo "</pre>";
}

?>

Sumber rujukan:http://api.bpjs-kesehatan.go.id