https://doc.wikimedia.org/mediawiki-core/master/php/interfaceMediaWiki_1_1User_1_1Hook_1_1InvalidateEmailCompleteHook.html
MediaWiki: MediaWiki\User\Hook\InvalidateEmailCompleteHook Interface Reference
mediawikiuserhookinterfacereference
https://doc.wikimedia.org/mediawiki-core/REL1_39/php/InvalidateEmailCompleteHook_8php.html
MediaWiki: includes/user/Hook/InvalidateEmailCompleteHook.php File Reference
mediawikiincludesuserhookphp