'Request has been successfully processed.', 'server_error' => 'Internal server error.', 'not_found' => 'Data not found.', 'password' => 'Password wrong. Please try again.', 'read_notification' => 'Notification has been read.', 'already_exists' => 'Data already exists.', 'logout' => 'User logged out successfully.', 'token_expired' => 'Token has expired. Please re-request the token.' ];