ext_localconf.php

<?php
defined('TYPO3_MODE') || die('Access denied.');

call_user_func(
    function()
    {
        \TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
            'MiniorangeSaml',
            'Fesaml',
            [ Miniorange\MiniorangeSaml\Controller\FesamlController::class => 'request' ],
            // non-cacheable actions
            [ Miniorange\MiniorangeSaml\Controller\FesamlController::class => 'control' ]
        );

        \TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
            'MiniorangeSaml',
            'Response',
            [ Miniorange\MiniorangeSaml\Controller\ResponseController::class => 'response' ]
        );

    // wizards
    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig(
        'mod {
            wizards.newContentElement.wizardItems.plugins {
                elements {
                    fesaml {
                        iconIdentifier = miniorange_saml-plugin-fesaml
                        title = LLL:EXT:miniorange_saml/Resources/Private/Language/locallang_db.xlf:tx_miniorangesaml_fesaml.name
                        description = LLL:EXT:miniorange_saml/Resources/Private/Language/locallang_db.xlf:tx_miniorangesaml_fesaml.description
                        tt_content_defValues {
                            CType = list
                            list_type = fesaml
                        }
                    }
                    response {
                        iconIdentifier = miniorange_saml-plugin-response
                        title = LLL:EXT:miniorange_saml/Resources/Private/Language/locallang_db.xlf:tx_miniorangesaml_response.name
                        description = LLL:EXT:miniorange_saml/Resources/Private/Language/locallang_db.xlf:tx_miniorangesaml_response.description
                        tt_content_defValues {
                            CType = list
                            list_type = response
                        }
                    }
                }
                show = *
            }
       }'
    );
		$iconRegistry = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Imaging\IconRegistry::class);
		
			$iconRegistry->registerIcon(
				'miniorange_saml-plugin-fesaml',
				\TYPO3\CMS\Core\Imaging\IconProvider\BitmapIconProvider::class,
				['source' => 'EXT:miniorange_saml/Resources/Public/Icons/miniorange.png']
			);

			$iconRegistry->registerIcon(
				'miniorange_saml-plugin-response',
				\TYPO3\CMS\Core\Imaging\IconProvider\BitmapIconProvider::class,
				['source' => 'EXT:miniorange_saml/Resources/Public/Icons/miniorange.png']
			);

        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addService(
            'miniorange_saml',
            'auth',
            Miniorange\MiniorangeSaml\Service\LoginUser::class,
            [
                'title' => 'SAML SSO Login',
                'description' => 'Allows sso for users',
                'subtype' => 'getUserFE, authUserFE',
                'available' => true,
                'priority' => 70,
                'quality' => 60,
                'className' => Miniorange\MiniorangeSaml\Service\LoginUser::class,
                'public' => true
            ]
        );

    }
);