diff --git a/.phan/config.php b/.phan/config.php
index c3247bd93..ce3b30d1c 100644
--- a/.phan/config.php
+++ b/.phan/config.php
@@ -6,7 +6,8 @@ $cfg['directory_list'] = array_merge(
 	$cfg['directory_list'],
 	[
 		'../../extensions/EventLogging',
-		'../../extensions/CentralAuth'
+		'../../extensions/CentralAuth',
+		'../../extensions/UserMerge',
 	]
 );
 
@@ -14,7 +15,8 @@ $cfg['exclude_analysis_directory_list'] = array_merge(
 	$cfg['exclude_analysis_directory_list'],
 	[
 		'../../extensions/EventLogging',
-		'../../extensions/CentralAuth'
+		'../../extensions/CentralAuth',
+		'../../extensions/UserMerge',
 	]
 );
 
diff --git a/extension.json b/extension.json
index 2280db198..a604b5878 100644
--- a/extension.json
+++ b/extension.json
@@ -447,9 +447,9 @@
 		"OutputPageCheckLastModified": "main",
 		"ArticleDeleteComplete": "main",
 		"ArticleUndelete": "main",
-		"UserMergeAccountFields": "MediaWiki\\Extension\\Notifications\\Hooks::onUserMergeAccountFields",
-		"MergeAccountFromTo": "MediaWiki\\Extension\\Notifications\\Hooks::onMergeAccountFromTo",
-		"UserMergeAccountDeleteTables": "MediaWiki\\Extension\\Notifications\\Hooks::onUserMergeAccountDeleteTables",
+		"UserMergeAccountFields": "usermerge",
+		"MergeAccountFromTo": "usermerge",
+		"UserMergeAccountDeleteTables": "usermerge",
 		"EchoGetBundleRules": "MediaWiki\\Extension\\Notifications\\Hooks::onEchoGetBundleRules",
 		"EchoAbortEmailNotification": "MediaWiki\\Extension\\Notifications\\Hooks::onEchoAbortEmailNotification",
 		"PageSaveComplete": "main",
@@ -475,6 +475,9 @@
 		},
 		"schema": {
 			"class": "MediaWiki\\Extension\\Notifications\\SchemaHooks"
+		},
+		"usermerge": {
+			"class": "MediaWiki\\Extension\\Notifications\\UserMergeHooks"
 		}
 	},
 	"config": {
diff --git a/includes/Hooks.php b/includes/Hooks.php
index c91a54203..77eb32a35 100644
--- a/includes/Hooks.php
+++ b/includes/Hooks.php
@@ -66,7 +66,6 @@ use MediaWiki\User\Options\Hook\LoadUserOptionsHook;
 use MediaWiki\User\Options\Hook\SaveUserOptionsHook;
 use MediaWiki\User\UserIdentity;
 use MediaWiki\WikiMap\WikiMap;
-use MWEchoDbFactory;
 use MWEchoNotifUser;
 use OutputPage;
 use RecentChange;
@@ -1458,107 +1457,6 @@ class Hooks implements
 		] );
 	}
 
-	/**
-	 * For integration with the UserMerge extension.
-	 *
-	 * @param array &$updateFields
-	 */
-	public static function onUserMergeAccountFields( &$updateFields ) {
-		// array( tableName, idField, textField )
-		$dbw = MWEchoDbFactory::newFromDefault()->getEchoDb( DB_PRIMARY );
-		$updateFields[] = [ 'echo_event', 'event_agent_id', 'db' => $dbw ];
-		$updateFields[] = [ 'echo_notification', 'notification_user', 'db' => $dbw, 'options' => [ 'IGNORE' ] ];
-		$updateFields[] = [ 'echo_email_batch', 'eeb_user_id', 'db' => $dbw, 'options' => [ 'IGNORE' ] ];
-	}
-
-	public static function onMergeAccountFromTo( User &$oldUser, User &$newUser ) {
-		$method = __METHOD__;
-		DeferredUpdates::addCallableUpdate( static function () use ( $oldUser, $newUser, $method ) {
-			if ( $newUser->isRegistered() ) {
-				// Select notifications that are now sent to the same user
-				$dbw = MWEchoDbFactory::newFromDefault()->getEchoDb( DB_PRIMARY );
-				$attributeManager = EchoServices::getInstance()->getAttributeManager();
-				$selfIds = $dbw->selectFieldValues(
-					[ 'echo_notification', 'echo_event' ],
-					'event_id',
-					[
-						'notification_user' => $newUser->getId(),
-						'notification_event = event_id',
-						'notification_user = event_agent_id',
-						'event_type NOT IN (' . $dbw->makeList( $attributeManager->getNotifyAgentEvents() ) . ')'
-					],
-					$method
-				) ?: [];
-
-				// Select newer welcome notification(s)
-				$welcomeIds = $dbw->selectFieldValues(
-					[ 'echo_notification', 'echo_event' ],
-					'event_id',
-					[
-						'notification_user' => $newUser->getId(),
-						'notification_event = event_id',
-						'event_type' => 'welcome',
-					],
-					$method,
-					[
-						'ORDER BY' => 'notification_timestamp ASC',
-						'OFFSET' => 1,
-					]
-				) ?: [];
-
-				// Select newer milestone notifications (per milestone level)
-				$counts = [];
-				$thankYouIds = [];
-				$thankYouRows = $dbw->select(
-					[ 'echo_notification', 'echo_event' ],
-					Event::selectFields(),
-					[
-						'notification_user' => $newUser->getId(),
-						'notification_event = event_id',
-						'event_type' => 'thank-you-edit',
-					],
-					$method,
-					[ 'ORDER BY' => 'notification_timestamp ASC' ]
-				) ?: [];
-				foreach ( $thankYouRows as $row ) {
-					$event = Event::newFromRow( $row );
-					$editCount = $event ? $event->getExtraParam( 'editCount' ) : null;
-					if ( $editCount ) {
-						if ( isset( $counts[$editCount] ) ) {
-							$thankYouIds[] = $row->event_id;
-						} else {
-							$counts[$editCount] = true;
-						}
-					}
-				}
-
-				// Delete notifications
-				$ids = array_merge( $selfIds, $welcomeIds, $thankYouIds );
-				if ( $ids !== [] ) {
-					$dbw->delete(
-						'echo_notification',
-						[
-							'notification_user' => $newUser->getId(),
-							'notification_event' => $ids
-						],
-						$method
-					);
-				}
-			}
-
-			MWEchoNotifUser::newFromUser( $oldUser )->resetNotificationCount();
-			if ( $newUser->isRegistered() ) {
-				MWEchoNotifUser::newFromUser( $newUser )->resetNotificationCount();
-			}
-		} );
-	}
-
-	public static function onUserMergeAccountDeleteTables( &$tables ) {
-		$dbw = MWEchoDbFactory::newFromDefault()->getEchoDb( DB_PRIMARY );
-		$tables['echo_notification'] = [ 'notification_user', 'db' => $dbw ];
-		$tables['echo_email_batch'] = [ 'eeb_user_id', 'db' => $dbw ];
-	}
-
 	/**
 	 * Sets custom login message for redirect from notification page
 	 *
diff --git a/includes/UserMergeHooks.php b/includes/UserMergeHooks.php
new file mode 100644
index 000000000..c3341ff5c
--- /dev/null
+++ b/includes/UserMergeHooks.php
@@ -0,0 +1,121 @@
+<?php
+
+namespace MediaWiki\Extension\Notifications;
+
+use DeferredUpdates;
+use EchoServices;
+use MediaWiki\Extension\Notifications\Model\Event;
+use MediaWiki\Extension\UserMerge\Hooks\AccountDeleteTablesHook;
+use MediaWiki\Extension\UserMerge\Hooks\AccountFieldsHook;
+use MediaWiki\Extension\UserMerge\Hooks\MergeAccountFromToHook;
+use MWEchoDbFactory;
+use MWEchoNotifUser;
+use User;
+
+class UserMergeHooks implements
+	AccountFieldsHook,
+	MergeAccountFromToHook,
+	AccountDeleteTablesHook
+{
+
+	/**
+	 * For integration with the UserMerge extension.
+	 *
+	 * @param array &$updateFields
+	 */
+	public function onUserMergeAccountFields( array &$updateFields ) {
+		// array( tableName, idField, textField )
+		$dbw = MWEchoDbFactory::newFromDefault()->getEchoDb( DB_PRIMARY );
+		$updateFields[] = [ 'echo_event', 'event_agent_id', 'db' => $dbw ];
+		$updateFields[] = [ 'echo_notification', 'notification_user', 'db' => $dbw, 'options' => [ 'IGNORE' ] ];
+		$updateFields[] = [ 'echo_email_batch', 'eeb_user_id', 'db' => $dbw, 'options' => [ 'IGNORE' ] ];
+	}
+
+	public function onMergeAccountFromTo( User &$oldUser, User &$newUser ) {
+		$method = __METHOD__;
+		DeferredUpdates::addCallableUpdate( static function () use ( $oldUser, $newUser, $method ) {
+			if ( $newUser->isRegistered() ) {
+				// Select notifications that are now sent to the same user
+				$dbw = MWEchoDbFactory::newFromDefault()->getEchoDb( DB_PRIMARY );
+				$attributeManager = EchoServices::getInstance()->getAttributeManager();
+				$selfIds = $dbw->selectFieldValues(
+					[ 'echo_notification', 'echo_event' ],
+					'event_id',
+					[
+						'notification_user' => $newUser->getId(),
+						'notification_event = event_id',
+						'notification_user = event_agent_id',
+						'event_type NOT IN (' . $dbw->makeList( $attributeManager->getNotifyAgentEvents() ) . ')'
+					],
+					$method
+				) ?: [];
+
+				// Select newer welcome notification(s)
+				$welcomeIds = $dbw->selectFieldValues(
+					[ 'echo_notification', 'echo_event' ],
+					'event_id',
+					[
+						'notification_user' => $newUser->getId(),
+						'notification_event = event_id',
+						'event_type' => 'welcome',
+					],
+					$method,
+					[
+						'ORDER BY' => 'notification_timestamp ASC',
+						'OFFSET' => 1,
+					]
+				) ?: [];
+
+				// Select newer milestone notifications (per milestone level)
+				$counts = [];
+				$thankYouIds = [];
+				$thankYouRows = $dbw->select(
+					[ 'echo_notification', 'echo_event' ],
+					Event::selectFields(),
+					[
+						'notification_user' => $newUser->getId(),
+						'notification_event = event_id',
+						'event_type' => 'thank-you-edit',
+					],
+					$method,
+					[ 'ORDER BY' => 'notification_timestamp ASC' ]
+				) ?: [];
+				foreach ( $thankYouRows as $row ) {
+					$event = Event::newFromRow( $row );
+					$editCount = $event ? $event->getExtraParam( 'editCount' ) : null;
+					if ( $editCount ) {
+						if ( isset( $counts[$editCount] ) ) {
+							$thankYouIds[] = $row->event_id;
+						} else {
+							$counts[$editCount] = true;
+						}
+					}
+				}
+
+				// Delete notifications
+				$ids = array_merge( $selfIds, $welcomeIds, $thankYouIds );
+				if ( $ids !== [] ) {
+					$dbw->delete(
+						'echo_notification',
+						[
+							'notification_user' => $newUser->getId(),
+							'notification_event' => $ids
+						],
+						$method
+					);
+				}
+			}
+
+			MWEchoNotifUser::newFromUser( $oldUser )->resetNotificationCount();
+			if ( $newUser->isRegistered() ) {
+				MWEchoNotifUser::newFromUser( $newUser )->resetNotificationCount();
+			}
+		} );
+	}
+
+	public function onUserMergeAccountDeleteTables( array &$tables ) {
+		$dbw = MWEchoDbFactory::newFromDefault()->getEchoDb( DB_PRIMARY );
+		$tables['echo_notification'] = [ 'notification_user', 'db' => $dbw ];
+		$tables['echo_email_batch'] = [ 'eeb_user_id', 'db' => $dbw ];
+	}
+}