ext_localconf.php

<?php
declare(strict_types=1);

use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
use TYPO3\CMS\Extbase\Utility\ExtensionUtility;

defined('TYPO3') || die();

ExtensionUtility::configurePlugin(
    'NewsletterSubscribe',
    'Subscribe',
    [
        \Zwo3\NewsletterSubscribe\Controller\SubscribeController::class => 'showForm, createConfirmation, unsubscribe, undosubscribe, doConfirm, createUnsubscribeMail',
    ],
    // non-cacheable actions
    [
        \Zwo3\NewsletterSubscribe\Controller\SubscribeController::class => 'showForm, createConfirmation, unsubscribe, undosubscribe, doConfirm, createUnsubscribeMail',
    ]
);
ExtensionUtility::configurePlugin(
    'NewsletterSubscribe',
    'Unsubscribe',
    [
        \Zwo3\NewsletterSubscribe\Controller\SubscribeController::class => 'showUnsubscribeForm, unsubscribe, undosubscribe, createUnsubscribeMail',
    ],
    // non-cacheable actions
    [
        \Zwo3\NewsletterSubscribe\Controller\SubscribeController::class => 'showUnsubscribeForm, unsubscribe, undosubscribe, createUnsubscribeMail',
    ]
);

// wizards
ExtensionManagementUtility::addPageTSConfig(
    'mod {
                wizards.newContentElement.wizardItems.plugins {
                    elements {
                        subscribe {
                            iconIdentifier = zwo3_newslettersubscribe-plugin-subscribe
                            title = LLL:EXT:newsletter_subscribe/Resources/Private/Language/locallang_db.xlf:tx_zwo3_newslettersubscribe_subscribe.name
                            description = LLL:EXT:newsletter_subscribe/Resources/Private/Language/locallang_db.xlf:tx_zwo3_newslettersubscribe_subscribe.description
                            tt_content_defValues {
                                CType = list
                                list_type = newslettersubscribe_subscribe
                            }
                        }
                        unsubscribe {
                            iconIdentifier = zwo3_newslettersubscribe-plugin-unsubscribe
                            title = LLL:EXT:newsletter_subscribe/Resources/Private/Language/locallang_db.xlf:tx_zwo3_newslettersubscribe_unsubscribe.name
                            description = LLL:EXT:newsletter_subscribe/Resources/Private/Language/locallang_db.xlf:tx_zwo3_newslettersubscribe_unsubscribe.description
                            tt_content_defValues {
                                CType = list
                                list_type = newslettersubscribe_unsubscribe
                            }
                        }
                    }

                    show = *
                }
            }'
);

foreach ([
             'tx_newslettersubscribe_subscribe[subscriptionHash]',
             'tx_newslettersubscribe_subscribe[uid]',
             'tx_newslettersubscribe_unsubscribe[subscriptionHash]',
             'tx_newslettersubscribe_unsubscribe[uid]'
         ] as $parameter) {
    $GLOBALS['TYPO3_CONF_VARS']['FE']['cacheHash']['excludedParameters'][] = $parameter;
}

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['scheduler']['tasks'][\Zwo3\NewsletterSubscribe\SchedulerTask\DeleteUnvalidatedSubscribersTask::class] = [
    'extension' => 'newsletter_subscribe',
    'title' => 'LLL:EXT:newsletter_subscribe/Resources/Private/Language/locallang.xlf:schedulerDeleteUnvalidated.name',
    'description' => 'LLL:EXT:newsletter_subscribe/Resources/Private/Language/locallang.xlf:schedulerDeleteUnvalidated.description',
    'additionalFields' => \Zwo3\NewsletterSubscribe\SchedulerTask\DeleteUnvalidatedSubscribersTaskAdditionalFieldProvider::class
];