public static Map<String, Object> createDefaultTemplateMap(NotificationDto<?> notification, ApiManagerConfig config) {
        return Map.of(
                "notification", notification,
                "event", notification.getPayload(),
                "apiman-manager-ui-endpoint", StringUtils.removeEnd(config.getApimanManagerUiEndpoint(), "/")
        );
    }
Observe, filter, and process notifications.

<ul>
    <li>Get email preferences for intended recipient</li>
    <li>Determine whether user wants emails for category notification belongs to</li>
    <li>If so, process notification, else drop through silently</li>
</ul>
manager/api/rest-impl/src/main/java/io/apiman/manager/api/notifications/email/EmailNotificationDispatcher.java