// Make a new RegisteredKey instance.
$regKey = new RegisteredKey(hidden);
// Add the vCode to keyID 1156.
$regKey->vCode = 'hidden';
// Add the API Mask to keyID 1156.
$regKey->activeAPIMask = hidden;
// Activate the API key.
$regKey->isActive = 1;
// Save the new API Key into the database.
if ($regKey->store()) {
  print 'Registered new API Key: ' . $regKey->keyID . ' to the database.' . PHP_EOL;
} else {
  print "API Key couldn't be added!" . PHP_EOL;
}
// Release everything.
$regKey = NULL;
unset($regKey);