$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://www.voxio.chat/external-api/inbox/conversation-list',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'GET',
  CURLOPT_HTTPHEADER => array(
    'client-id: YOUR-CLIENT-ID',
    'client-secret: YOUR-CLIENT-SECRET',
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://www.voxio.chat/external-api/inbox/conversation-messages/{conversation_id}',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'GET',
  CURLOPT_HTTPHEADER => array(
    'client-id: YOUR-CLIENT-ID',
    'client-secret: YOUR-CLIENT-SECRET'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://www.voxio.chat/external-api/inbox/change-conversation-status/2',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS => array('status' => '1'),
  CURLOPT_HTTPHEADER => array(
    'client-id: YOUR-CLIENT-ID',
    'client-secret: YOUR-CLIENT-SECRET',
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://www.voxio.chat/external-api/inbox/conversation-details/2',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'GET',
  CURLOPT_HTTPHEADER => array(
    'client-id: YOUR-CLIENT-ID',
    'client-secret: YOUR-CLIENT-SECRET',
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://www.voxio.chat/external-api/inbox/send-message',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS => array(
    'mobile_code' => '880',
    'mobile' => 'xxxxxxxxx',
    'message' => 'Hello world',
    'from_number' => '6281234567890'
  ),
  CURLOPT_HTTPHEADER => array(
    'client-id: YOUR-CLIENT-ID',
    'client-secret: YOUR-CLIENT-SECRET',
  ),
));
$response = curl_exec($curl);
curl_close($curl);
echo $response;

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://www.voxio.chat/external-api/inbox/send-template-message',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS => array(
    'mobile_code' => '880',
    'mobile' => 'xxxxxx',
    'template_id' => 'your template id',
    'from_number' => '6281234567890',
    'header_variables[0]' => 'Customer Name',
    'body_variables[0]' => 'INV-1001',
    'body_variables[1]' => 'Rp500.000'
  ),
  CURLOPT_HTTPHEADER => array(
    'client-id: YOUR-CLIENT-ID',
    'client-secret: YOUR-CLIENT-SECRET',
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://www.voxio.chat/external-api/inbox/template-list',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'GET',
  CURLOPT_HTTPHEADER => array(
    'client-id: YOUR-CLIENT-ID',
    'client-secret: YOUR-CLIENT-SECRET',
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

$payload = file_get_contents('php://input');
$timestamp = $_SERVER['HTTP_X_VOXIO_TIMESTAMP'] ?? '';
$signature = $_SERVER['HTTP_X_VOXIO_SIGNATURE_V2'] ?? '';
$deliveryId = $_SERVER['HTTP_X_VOXIO_DELIVERY_ID'] ?? '';

// Relay Secret is configured in Voxio Inbound Relay settings and is never sent.
$relaySecret = 'YOUR_RELAY_SECRET';

if (!ctype_digit($timestamp) || abs(time() - (int) $timestamp) > 300) {
    http_response_code(401);
    exit('Invalid or stale timestamp');
}

$expected = 'sha256=' . hash_hmac('sha256', $timestamp . '.' . $payload, $relaySecret);

if (!hash_equals($expected, $signature)) {
    http_response_code(401);
    exit('Invalid signature');
}

// Persist deliveryId if you need receiver-side idempotency across retries.

$event = $_SERVER['HTTP_X_VOXIO_EVENT'] ?? 'unknown';
$data = json_decode($payload, true);

http_response_code(200);
echo json_encode(['ok' => true, 'event' => $event]);