use BracketSpace\Notification\Defaults\MergeTag;
add_action(
'notification/trigger/merge_tags',
function($trigger) {
if ($trigger->getSlug() !== 'user/registered') {
return;
}
$trigger->addMergeTag(new MergeTag\User\UserNicename());
$trigger->addMergeTag(new MergeTag\User\UserDisplayName());
$trigger->addMergeTag(new MergeTag\User\UserFirstName());
$trigger->addMergeTag(new MergeTag\User\UserLastName());
$trigger->addMergeTag(new MergeTag\User\UserBio());
}
);