i'm a newbie to mediawiki i have installed it on GCP through bitnami, can someone tell me how to integrate slack to mediawiki to get notification, i've followed this Extension:SlackNotifications documentation to install extension, i can see the extension is installed but i was unable to get notification on slack channel. this is my configuration
require_once("$IP/extensions/SlackNotifications/SlackNotifications.php");
$wgSlackIncomingWebhookUrl = "Slack_hook_URL";
$wgSlackFromName = $wgSitename;
$wgWikiUrl = "WIKI_URL";
$wgWikiUrlEnding = "index.php?title=";
$wgSlackSendMethod = "curl";
$wgSlackRoomName = "#alerts";
$wgSlackIncludeNotificationsFrom = ["Spark"];
$wgSlackNotificationAddedArticle = true;
$wgSlackNotificationEditedArticle = true;
$wgSlackNotificationRemovedArticle = true;