feat(payments): Express-Kauf aus dem Warenkorb (PayPal v2): Start ohne Bestellung, Adresse von PayPal, Kasse vorbelegt, Capture ohne zweiten Besuch

modules/website_shoppingcart.php

@@ -56,14 +56,44 @@ class website_shoppingcart {
 		}
 		
 		$data = $this->shoppingcart_object->get_data();
-		
+
 		$this->layout_object->assign('shoppingcart', $data);
 		$this->layout_object->assign('shoppingcartVATUsage', $this->base_object->customer_group->show_tax);
+
+		// 14.09.2026: Express-Buttons der Zahlungsanbieter ("Direkt mit PayPal bezahlen").
+		// Angezeigt, wenn der Anbieter Express kann und seine Zahlart aktiv ist.
+		$this->layout_object->assign('express_providers', $this->express_providers());
 		
 		return $this->layout_object->_fetch('content_shoppingcart.tpl');
 	} // end show_shoppingcart
 
 
+	/** @return array<int,array{module:string,label:string}> */
+	private function express_providers() {
+		$out = array();
+		$file = $_SERVER['DOCUMENT_ROOT'].'/core/payments/Registry.php';
+		if (!is_file($file)) {
+			return $out;
+		}
+		include_once $file;
+		$res = $this->base_object->db->query("SELECT module FROM payment_methods WHERE active=1 AND module<>''");
+		while ($res && ($row = $res->fetch_object())) {
+			$module = (string)$row->module;
+			if (!\Payments\Registry::has($module)) {
+				continue;
+			}
+			try {
+				$p = \Payments\Registry::get($module, $this->base_object);
+				if ($p && $p->supportsExpress()) {
+					$out[] = array('module' => $module, 'label' => $p->label());
+				}
+			} catch (Throwable $e) {
+				error_log('Payments express button '.$module.': '.$e->getMessage());
+			}
+		}
+		return $out;
+	}
+
 	private function update_shoppingcart() {
 		foreach ($_POST['update_item'] as $item => $quantity) {
 			if ($quantity > 0) {