php
$phoneNumberId = "123456";  // Replace with actual phone number ID
$authToken = "XXXXXXXXXXXXXXXXXXXXX";  // Replace with actual token

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.vapi.ai/phone-number/{$phoneNumberId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer {$authToken}",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  $responseData = json_decode($response, true);

  // Print the entire response for debugging
  echo "<pre>";
  print_r($responseData);
  echo "</pre>";
  
  // Check if 'serverUrl' is present in the response
  if (isset($responseData['serverUrl'])) {
    echo "Server URL: " . $responseData['serverUrl'];
  } else {
    echo "Server URL is not present in the response.";
  }
}