feat: improved promotional and purchase vouchers

src/Form/Service/ParticipantPurchaseVoucherFieldHandler.php

@@ -9,17 +9,11 @@ use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
 use App\Service\VoucherValidationService;
 
 /**
- * Handles processing and validation of purchase voucher codes for booking participants.
+ * Handles purchase voucher code field processing.
  *
- * This handler validates purchase vouchers (including goodwill vouchers) via the BPN API
- * and provides immediate feedback to users about voucher validity and remaining balance.
- * Purchase vouchers reduce the booking price by their remaining balance and support
- * partial redemption.
- *
- * Validation includes:
- * - Voucher existence check
- * - Remaining balance verification (zero-balance vouchers are reported as invalid)
- * - Real-time API validation with 15-minute caching
+ * Detects goodwill (Kulanz) vouchers and marks them for special XML handling.
+ * Goodwill vouchers must be sent as <aktionscode> per participant, not aggregated
+ * in <gutscheine> collection. Validation is performed by PurchaseVoucher constraint.
  *
  * Dependencies: None (purchase vouchers don't require price calculation)
  */
@@ -62,23 +56,17 @@ class ParticipantPurchaseVoucherFieldHandler extends AbstractParticipantFieldHan
             return;
         }
 
-        // Validate voucher via API
+        // Validate voucher to check if it's goodwill type
         $result = $this->voucherValidationService->validatePurchaseVoucher($voucherCode);
 
-        if (true === $result->isValid && null !== $result->voucher) {
-            $participant->addNotification(
-                'success',
-                sprintf(
-                    'Gutschein gültig: %s (Restwert: %.2f €)',
-                    $result->voucher->type,
-                    $result->voucher->remainingBalance
-                )
-            );
-        } else {
-            $participant->addNotification(
-                'error',
-                sprintf('Gutschein ungültig: %s', $result->errorMessage ?? 'Unbekannter Fehler')
-            );
+        // Only process valid vouchers
+        if (false === $result->isValid || null === $result->voucher) {
+            return;
+        }
+
+        // Check if this is a goodwill voucher
+        if (true === $result->voucher->isGoodwill()) {
+            $participant->hasGoodwillVoucher = true;
         }
     }
 }