diff --git a/.phpcs.xml b/.phpcs.xml
index bea60bd..46eab63 100644
--- a/.phpcs.xml
+++ b/.phpcs.xml
@@ -6,6 +6,7 @@
 		<exclude name="MediaWiki.Commenting.FunctionComment.MissingDocumentationProtected" />
 		<exclude name="MediaWiki.Commenting.FunctionComment.MissingDocumentationPublic" />
 		<exclude name="Squiz.Scope.MethodScope.Missing" />
+		<exclude name="PSR12.Properties.ConstantVisibility.NotFound" />
 	</rule>
 	<file>.</file>
 	<arg name="extensions" value="php" />
diff --git a/ContributionScores.php b/ContributionScores.php
index 9e96446..2134105 100644
--- a/ContributionScores.php
+++ b/ContributionScores.php
@@ -1,109 +1,16 @@
 <?php
-/** \file
- * \brief Contains setup code for the Contribution Scores Extension.
- */
 
-# Not a valid entry point, skip unless MEDIAWIKI is defined
-if ( !defined( 'MEDIAWIKI' ) ) {
-	echo 'Contribution Scores extension';
-	exit( 1 );
-}
-
-$wgExtensionCredits['specialpage'][] = [
-	'path' => __FILE__,
-	'name' => 'Contribution Scores',
-	'url' => 'https://www.mediawiki.org/wiki/Extension:Contribution_Scores',
-	'author' => 'Tim Laqua',
-	'descriptionmsg' => 'contributionscores-desc',
-	'version' => '1.25.0'
-];
-
-define( 'CONTRIBUTIONSCORES_MAXINCLUDELIMIT', 50 );
-$wgContribScoreReports = null;
-
-// These settings can be overridden in LocalSettings.php.
-
-// Set to true to exclude bots from the reporting.
-$wgContribScoreIgnoreBlockedUsers = false;
-
-// Set to true to exclude blocked users from the reporting.
-$wgContribScoreIgnoreBots = false;
-
-// Set to true to use real user names when available. Only for MediaWiki 1.19 and later.
-$wgContribScoresUseRealName = false;
-
-// Set to true to disable cache for parser function and inclusion of table.
-$wgContribScoreDisableCache = false;
-
-$wgAutoloadClasses['ContributionScores'] = __DIR__ . '/ContributionScores_body.php';
-$wgSpecialPages['ContributionScores'] = 'ContributionScores';
-
-$wgMessagesDirs['ContributionScores'] = __DIR__ . '/i18n';
-$wgExtensionMessagesFiles['ContributionScoresAlias'] = __DIR__ . '/ContributionScores.alias.php';
-$wgExtensionMessagesFiles['ContributionScoresMagic'] =
-	__DIR__ . '/ContributionScores.i18n.magic.php';
-
-$wgHooks['ParserFirstCallInit'][] = 'efContributionScores_Setup';
-
-function efContributionScores_Setup( &$parser ) {
-	$parser->setFunctionHook( 'cscore', 'efContributionScores_Render' );
-
-	return true;
-}
-
-function efContributionScores_Render( &$parser, $usertext, $metric = 'score' ) {
-	global $wgContribScoreDisableCache;
-
-	if ( $wgContribScoreDisableCache ) {
-		$parser->getOutput()->updateCacheExpiry( 0 );
-	}
-
-	$user = User::newFromName( $usertext );
-	$dbr = wfGetDB( DB_REPLICA );
-
-	if ( $user instanceof User && $user->isLoggedIn() ) {
-		global $wgLang;
-
-		$revWhere = ActorMigration::newMigration()->getWhere( $dbr, 'rev_user', $user );
-		if ( $metric == 'score' ) {
-			$res = $dbr->select(
-				[ 'revision' ] + $revWhere['tables'],
-				'COUNT(DISTINCT rev_page)+SQRT(COUNT(rev_id)-COUNT(DISTINCT rev_page))*2 AS wiki_rank',
-				$revWhere['conds'],
-				__METHOD__,
-				[],
-				$revWhere['joins']
-			);
-			$row = $dbr->fetchObject( $res );
-			$output = $wgLang->formatNum( round( $row->wiki_rank, 0 ) );
-		} elseif ( $metric == 'changes' ) {
-			$res = $dbr->select(
-				[ 'revision' ] + $revWhere['tables'],
-				'COUNT(rev_id) AS rev_count',
-				$revWhere['conds'],
-				__METHOD__,
-				[],
-				$revWhere['joins']
-			);
-			$row = $dbr->fetchObject( $res );
-			$output = $wgLang->formatNum( $row->rev_count );
-		} elseif ( $metric == 'pages' ) {
-			$res = $dbr->select(
-				[ 'revision' ] + $revWhere['tables'],
-				'COUNT(DISTINCT rev_page) AS page_count',
-				$revWhere['conds'],
-				__METHOD__,
-				[],
-				$revWhere['joins']
-			);
-			$row = $dbr->fetchObject( $res );
-			$output = $wgLang->formatNum( $row->page_count );
-		} else {
-			$output = wfMessage( 'contributionscores-invalidmetric' )->text();
-		}
-	} else {
-		$output = wfMessage( 'contributionscores-invalidusername' )->text();
-	}
-
-	return $parser->insertStripItem( $output, $parser->mStripState );
+if ( function_exists( 'wfLoadExtension' ) ) {
+	wfLoadExtension( 'ContributionScores' );
+	// Keep i18n globals so mergeMessageFileList.php doesn't break
+	$wgMessageDirs['ContributionScores'] = __DIR__ . '/i18n';
+	$wgExtensionMessagesFiles['ContributionScoresAlias'] = __DIR__ . '/ContributionScores.alias.php';
+	$wgExtensionMessagesFiles['ContributionScoresMagic'] = __DIR__ . '/ContributionScores.i18n.magic.php';
+	wfWarn(
+		'Deprecated PHP entry point used for ContributionScores extension. ' .
+		'Please use wfLoadExtension instead, ' .
+		'see https://www.mediawiki.org/wiki/Extension_registration for more details.'
+	);
+} else {
+	die( 'This version of the ContributionScores extension requires MediaWiki 1.29+' );
 }
diff --git a/ContributionScores_body.php b/ContributionScores_body.php
index 9a59c5b..5cca29c 100644
--- a/ContributionScores_body.php
+++ b/ContributionScores_body.php
@@ -15,10 +15,72 @@ use MediaWiki\MediaWikiServices;
  * @author Tim Laqua <t.laqua@gmail.com>
  */
 class ContributionScores extends IncludableSpecialPage {
+	const CONTRIBUTIONSCORES_MAXINCLUDELIMIT = 50;
+
 	public function __construct() {
 		parent::__construct( 'ContributionScores' );
 	}
 
+	public static function onParserFirstCallInit( Parser $parser ) {
+		$parser->setFunctionHook( 'cscore', [ self::class, 'efContributionScoresRender' ] );
+	}
+
+	public static function efContributionScoresRender( $parser, $usertext, $metric = 'score' ) {
+		global $wgContribScoreDisableCache;
+
+		if ( $wgContribScoreDisableCache ) {
+			$parser->getOutput()->updateCacheExpiry( 0 );
+		}
+
+		$user = User::newFromName( $usertext );
+		$dbr = wfGetDB( DB_REPLICA );
+
+		if ( $user instanceof User && $user->isLoggedIn() ) {
+			global $wgLang;
+
+			$revWhere = ActorMigration::newMigration()->getWhere( $dbr, 'rev_user', $user );
+			if ( $metric == 'score' ) {
+				$res = $dbr->select(
+					[ 'revision' ] + $revWhere['tables'],
+					'COUNT(DISTINCT rev_page)+SQRT(COUNT(rev_id)-COUNT(DISTINCT rev_page))*2 AS wiki_rank',
+					$revWhere['conds'],
+					__METHOD__,
+					[],
+					$revWhere['joins']
+				);
+				$row = $dbr->fetchObject( $res );
+				$output = $wgLang->formatNum( round( $row->wiki_rank, 0 ) );
+			} elseif ( $metric == 'changes' ) {
+				$res = $dbr->select(
+					[ 'revision' ] + $revWhere['tables'],
+					'COUNT(rev_id) AS rev_count',
+					$revWhere['conds'],
+					__METHOD__,
+					[],
+					$revWhere['joins']
+				);
+				$row = $dbr->fetchObject( $res );
+				$output = $wgLang->formatNum( $row->rev_count );
+			} elseif ( $metric == 'pages' ) {
+				$res = $dbr->select(
+					[ 'revision' ] + $revWhere['tables'],
+					'COUNT(DISTINCT rev_page) AS page_count',
+					$revWhere['conds'],
+					__METHOD__,
+					[],
+					$revWhere['joins']
+				);
+				$row = $dbr->fetchObject( $res );
+				$output = $wgLang->formatNum( $row->page_count );
+			} else {
+				$output = wfMessage( 'contributionscores-invalidmetric' )->text();
+			}
+		} else {
+			$output = wfMessage( 'contributionscores-invalidusername' )->text();
+		}
+		return $parser->insertStripItem( $output, $parser->mStripState );
+	}
+
 	/// Generates a "Contribution Scores" table for a given LIMIT and date range
 
 	/**
@@ -257,7 +319,7 @@ class ContributionScores extends IncludableSpecialPage {
 			}
 		}
 
-		if ( empty( $limit ) || $limit < 1 || $limit > CONTRIBUTIONSCORES_MAXINCLUDELIMIT ) {
+		if ( empty( $limit ) || $limit < 1 || $limit > self::CONTRIBUTIONSCORES_MAXINCLUDELIMIT ) {
 			$limit = 10;
 		}
 		if ( $days === null || $days < 0 ) {
diff --git a/extension.json b/extension.json
new file mode 100644
index 0000000..c9b217c
--- /dev/null
+++ b/extension.json
@@ -0,0 +1,52 @@
+{
+	"name": "ContributionScores",
+	"author": "Tim Laqua",
+	"url": "https://www.mediawiki.org/wiki/Extension:Contribution_Scores",
+	"descriptionmsg": "contributionscore-desc",
+	"version": "1.25.0",
+	"type": "specialpage",
+	"requires": {
+		"MediaWiki": ">= 1.33.0"
+	},
+	"SpecialPages": {
+		"ContributionScores": "ContributionScores"
+	},
+	"AutoloadClasses": {
+		"ContributionScores": "ContributionScores_body.php"
+	},
+	"Hooks": {
+		"ParserFirstCallInit": "ContributionScores::onParserFirstCallInit"
+	},
+	"MessagesDirs": {
+		"ContributionScores": [
+			"i18n"
+		]
+	},
+	"ExtensionMessagesFiles": {
+		"ContribScoreAlias": "ContributionScores.alias.php",
+		"ContribScoreMagic": "ContributionScores.i18n.magic.php"
+	},
+	"config": {
+		"ContribScoreReports": {
+			"value": null,
+			"description": "Each array defines a report - 7,50 is \"past 7 days \" and \"LIMIT 50 \" - Can be omitted."
+		},
+		"ContribScoreIgnoreBlockedUsers": {
+			"value": false,
+			"description": "Set to true to exclude blocked users from the reporting."
+		},
+		"ContribScoreIgnoreBots": {
+			"value": false,
+			"description": "Set to true to exclude bots users from the reporting."
+		},
+		"ContribScoresUseRealName": {
+			"value": false,
+			"description": "Set to true to use real user names when available."
+		},
+		"ContribScoreDisableCache": {
+			"value": false,
+			"description": "Set to true to disable cache for parser function and inclusion of table."
+		}
+	},
+	"manifest_version": 2
+}