Drupal Commerce | Hide or set an alias to the order number in the checkout path Is there any DC module or configuration that would allow me to set an alias for the order number that is shown on the checkout path.

i.e.

Instead of example.com/checkout/10

Something like example.com/checkout/order or just plain example.com/checkout

An alias module would have similar functionalities as the me module.
I to went that road, did not want customers to see an on each order incrementing ID in URL's. In hook_url_outbound_alter() any path can be encrypted by altering the regular expression.

/**
 * Implements hook_url_inbound_alter().
 */
function mymodule_url_inbound_alter(&amp;$path, $original_path, $path_language) {
  // Decrypt paths that are encrypted by our hook_url_outbound_alter() to hide possible id's in paths.
  if (preg_match('#^ENC:(.+)#', $path, $m)) {
    $path = _mymodule_mcrypt('decrypt', $m[1]);
  }
}

/**
 * Implements hook_url_outbound_alter().
 */
function mymodule_url_outbound_alter(&amp;$path, &amp;$options, $original_path) {
  // To hide id's in paths, we encrypt them.
  if (preg_match('#^checkout/.*#', $path, $m)) {
    $path = 'ENC:' . _mymodule_mcrypt('encrypt', $path);
  }
}

/**
 * Helper function to encrypt and decrypt strings, ie. paths to hide containing id's.
 * NB: We replace forward slashes for exclamation marks, otherwise trailing 
 *     slashes in the URL will be ignored by Drupal.
 */
function _mymodule_mcrypt($action, $string, $key = null) {
  if (!$key) {
    $key = $GLOBALS['drupal_hash_salt'];
  }

  $mcrypt_method = MCRYPT_RIJNDAEL_128;
  $iv_size = mcrypt_get_iv_size($mcrypt_method, MCRYPT_MODE_CBC);

  // Make key exactly as long as long as $iv_size.
  $key = substr(str_repeat($key, CEIL($iv_size / strlen($key))), 0, $iv_size);

  if ($action == 'encrypt') {
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $encrypted_string = base64_encode($iv . mcrypt_encrypt($mcrypt_method, $key, $string, MCRYPT_MODE_CBC, $iv));
    return preg_replace('#/#', '!', $encrypted_string);
  }
  elseif ($action == 'decrypt') {
    $decrypted_string = base64_decode(preg_replace('#!#', '/', $string));
    $iv = substr($decrypted_string, 0, $iv_size);
    $decrypted_string = substr($decrypted_string, $iv_size);

    return rtrim(mcrypt_decrypt($mcrypt_method, $key, $decrypted_string, MCRYPT_MODE_CBC, $iv));
  }

  return false;
}