auth0 access token

// Token for testing
https://auth0.com/docs/api/management/v2/get-access-tokens-for-test

//access token for production
https://auth0.com/docs/api/management/v2/get-access-tokens-for-production

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://YOUR_DOMAIN/oauth/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "grant_type=client_credentials&client_id=%24%7Baccount.clientId%7D&client_secret=YOUR_CLIENT_SECRET&audience=https%3A%2F%2F%24%7Baccount.namespace%7D%2Fapi%2Fv2%2F",
  CURLOPT_HTTPHEADER => array(
    "content-type: application/x-www-form-urlencoded"
  ),
));

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

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}