feat: promotional and purchase vouchers

src/Form/Service/ParticipantFieldOptionsProvider.php

@@ -504,6 +504,30 @@ class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
             },
         ];
 
+        // Purchase voucher field provider - redemption code for vouchers that apply to complete booking
+        // Collected from all participants and aggregated into single <gutscheine> collection in booking payload
+        $this->fieldOptionProviders['purchaseVoucherCode'] = fn (BookingDto $bookingDto, int $participantIndex, array $options = []) => [
+            'label' => 'Gutschein-Einlösecode',
+            'required' => false,
+            'attr' => [
+                'placeholder' => 'z.B. 1F7V6PADRZ',
+                'maxlength' => 50,
+            ],
+            'sanitize_html' => true,
+        ];
+
+        // Promo voucher field provider - promo code applied per participant in booking payload
+        // Included in participant XML node as <aktionscode>
+        $this->fieldOptionProviders['promoVoucherCode'] = fn (BookingDto $bookingDto, int $participantIndex, array $options = []) => [
+            'label' => 'Aktionscode',
+            'required' => false,
+            'attr' => [
+                'placeholder' => 'z.B. LW0705',
+                'maxlength' => 50,
+            ],
+            'sanitize_html' => true,
+        ];
+
         // Future field providers would be added here, for example:
         //
         // $this->fieldOptionProviders['mealPreference'] = fn($bookingDto, $participantIndex) => [