diff --git a/Classes/Api/FeUserMarkerApi.php b/Classes/Api/FeUserMarkerApi.php
new file mode 100644
index 000000000..659e46329
--- /dev/null
+++ b/Classes/Api/FeUserMarkerApi.php
@@ -0,0 +1,142 @@
+<?php
+
+declare(strict_types=1);
+
+namespace JambageCom\TtProducts\Api;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+/**
+ * Part of the tt_products (Shop System) extension.
+ *
+ * FE user marker functions
+ *
+ * @author  Franz Holzinger <franz@ttproducts.de>
+ *
+ * @package TYPO3
+ * @subpackage tt_products
+ */
+use TYPO3\CMS\Core\SingletonInterface;
+use JambageCom\Div2007\Api\Frontend;
+use TYPO3\CMS\Core\Context\Context;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Core\Utility\MathUtility;
+
+class FeUserMarkerApi implements SingletonInterface
+{
+    public function getWrappedSubpartArray(
+        $modelObj,
+        $viewTagArray,
+        array &$subpartArray,
+        array &$wrappedSubpartArray
+    ): void {
+        $api =
+            GeneralUtility::makeInstance(Frontend::class);
+        $context = GeneralUtility::makeInstance(Context::class);
+
+        $typoScriptFrontendController = $api->getTypoScriptFrontendController();
+        $marker = 'FE_GROUP';
+        $markerLogin = 'LOGIN';
+        $markerNologin = 'NOLOGIN';
+        foreach ($viewTagArray as $tag => $value) {
+            if (strpos($tag, $marker . '_') === 0) {
+                $tagPart1 = substr($tag, strlen($marker . '_'));
+                $offset = strpos($tagPart1, '_TEMPLATE');
+                if ($offset > 0) {
+                    $groupNumber = substr($tagPart1, 0, $offset);
+
+                    if (MathUtility::canBeInterpretedAsInteger($groupNumber)) {
+                        $comparatorNumber = $groupNumber;
+                        if (!$comparatorNumber) {
+                            $comparatorNumber = -1; // Also a logged in Front End User has group 0!
+                        }
+
+                        if (
+                            GeneralUtility::inList(
+                                implode(
+                                    ',',
+                                    GeneralUtility::makeInstance(
+                                        Context::class
+                                    )->getPropertyFromAspect('frontend.user', 'groupIds')),
+                                $comparatorNumber
+                            )
+                        ) {
+                            $wrappedSubpartArray['###FE_GROUP_' . $groupNumber . '_TEMPLATE###'] = ['', ''];
+                        } else {
+                            $subpartArray['###FE_GROUP_' . $groupNumber . '_TEMPLATE###'] = '';
+                        }
+                    }
+                }
+            } elseif (strpos($tag, $markerLogin . '_') === 0) {
+                if (
+                    $context->getPropertyFromAspect('frontend.user', 'isLoggedIn')
+                ) {
+                    $wrappedSubpartArray['###LOGIN_TEMPLATE###'] = ['', ''];
+                } else {
+                    $subpartArray['###LOGIN_TEMPLATE###'] = '';
+                }
+            } elseif (strpos($tag, $markerNologin . '_') === 0) {
+                if (
+                    $context->getPropertyFromAspect('frontend.user', 'isLoggedIn')
+                ) {
+                    $subpartArray['###NOLOGIN_TEMPLATE###'] = '';
+                } else {
+                    $wrappedSubpartArray['###NOLOGIN_TEMPLATE###'] = ['', ''];
+                }
+            }
+        }
+
+        if (
+            isset($viewTagArray['FE_CONDITION1_TRUE_TEMPLATE']) ||
+            isset($viewTagArray['FE_CONDITION1_FALSE_TEMPLATE'])
+        ) {
+            if (
+                method_exists($modelObj, 'getCondition') &&
+                $modelObj->getCondition() ||
+                method_exists($modelObj, 'getConditionRecord') &&
+                !$modelObj->getConditionRecord()
+            ) {
+                $wrappedSubpartArray['###FE_CONDITION1_TRUE_TEMPLATE###'] = ['', ''];
+                $subpartArray['###FE_CONDITION1_FALSE_TEMPLATE###'] = '';
+            } else {
+                $wrappedSubpartArray['###FE_CONDITION1_FALSE_TEMPLATE###'] = ['', ''];
+                $subpartArray['###FE_CONDITION1_TRUE_TEMPLATE###'] = '';
+            }
+        }
+
+        if (isset($viewTagArray['FEUSER_HAS_DISCOUNT'])) {
+            $discountApi = GeneralUtility::makeInstance(DiscountApi::class);
+            $discountArray = $discountApi->getFeuserDiscounts();
+            $hasDiscount = is_array($discountArray) && (count($discountArray) > 0);
+
+            if (
+                $hasDiscount
+            ) {
+                $wrappedSubpartArray['###FEUSER_HAS_DISCOUNT###'] = ['', ''];
+                $subpartArray['###FEUSER_HAS_NO_DISCOUNT###'] = '';
+            } else {
+                $subpartArray['###FEUSER_HAS_DISCOUNT###'] = '';
+                $wrappedSubpartArray['###FEUSER_HAS_NO_DISCOUNT###'] = ['', ''];
+            }
+        }
+    }
+
+    public function getGlobalMarkerArray(
+        &$markerArray
+    ): void {
+        $discountApi = GeneralUtility::makeInstance(DiscountApi::class);
+        $discountValue = $discountApi->getMaximumFeuserDiscount();
+        $markerArray['###FEUSER_TOTAL_DISCOUNT###'] = $discountValue;
+        $markerArray['###FE_USER_TT_PRODUCTS_DISCOUNT###'] = $discountValue; // deprecated -> 2025
+    }
+}