ext_localconf.php

<?php

defined('TYPO3') or die();

/*
 * Configure the Plugin to call the right combination of Controller and Action according to
 * the user input (default settings, FlexForm, URL etc.)
 */
\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
    'Sessionpassword',
    'Password',
    [\B13\Sessionpassword\Controller\PasswordController::class => 'unlock'],
    [\B13\Sessionpassword\Controller\PasswordController::class => 'unlock']
);

// hook to see if the content object is allowed to render anything at all,
// based on the data inside the cObj
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_content.php']['cObjTypeAndClass']['sessionpassword'] = [
    'sessionpassword',    // key for the array
    \B13\Sessionpassword\Service\ContentObjectService::class,    // class to instantiate
];

$versionInformation = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Information\Typo3Version::class);
if ($versionInformation->getMajorVersion() === 10) {
    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addService(
        'sessionpassword',
        'auth',
        'tx_sessionpassword_fegroups',
        [
            'title' => 'Session password groups',
            'description' => 'Adds frontend usergroups by checking the session data for stored passwords by tx_sessionpassword.',
            'subtype' => 'getGroupsFE',
            'available' => true,
            'priority' => 20,
            'quality' => 20,
            'className' => \B13\Sessionpassword\Service\FrontendUsergroupService::class,
        ]
    );
}