diff --git a/config/services.yaml b/config/services.yaml
index 820a3aa..48b7273 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -67,14 +67,21 @@ services:
             $preferRemote: '%env(bool:APP_TRAVEL_PREFER_REMOTE)%'
             $enableFallback: '%env(bool:APP_TRAVEL_ENABLE_FALLBACK)%'
 
+    App\Service\VoucherValidationService:
+        arguments:
+            $cache: '@cache.app'
+            $logger: '@monolog.logger.bpn'
+
     App\Form\Service\Factory\ParticipantRoomChoiceLoaderFactory:
         arguments:
             $choiceListFactory: '@form.choice_list_factory.default'
 
-    # Insurance Field Handlers with dependencies
+    # Field Handlers with dependencies
     App\Form\Service\ParticipantInsuranceFieldHandler: ~
     App\Form\Service\ParticipantBulkInsuranceFieldHandler: ~
     App\Form\Service\ParticipantTransportationDiscountReplacementFieldHandler: ~
+    App\Form\Service\ParticipantPurchaseVoucherFieldHandler: ~
+    App\Form\Service\ParticipantPromoVoucherFieldHandler: ~
 
     # Participant Field Handler Registry - most handlers instantiate dependencies directly, some use services
     App\Form\Service\ParticipantFieldHandlerRegistry:
@@ -99,6 +106,8 @@ services:
                 - '@App\Form\Service\ParticipantTransportationDiscountReplacementFieldHandler'
                 - '@App\Form\Service\ParticipantBulkInsuranceFieldHandler'
                 - '@App\Form\Service\ParticipantInsuranceFieldHandler'
+                - '@App\Form\Service\ParticipantPurchaseVoucherFieldHandler'
+                - '@App\Form\Service\ParticipantPromoVoucherFieldHandler'
 
     App\Service\CmsDataService:
       arguments:
diff --git a/src/BusProNet/ApiClient.php b/src/BusProNet/ApiClient.php
index 32a940f..9430afb 100644
--- a/src/BusProNet/ApiClient.php
+++ b/src/BusProNet/ApiClient.php
@@ -12,6 +12,8 @@ use App\BusProNet\Model\BookingUpdate;
 use App\BusProNet\Model\CrmAttributes;
 use App\BusProNet\Model\Notification;
 use App\BusProNet\Model\PersonalData;
+use App\BusProNet\Model\PromoVoucher;
+use App\BusProNet\Model\PurchaseVoucher;
 use App\BusProNet\Model\Travel;
 use App\BusProNet\Traits\ApiClientTrait;
 use App\BusProNet\XmlParser\ApiResponseParser;
@@ -39,6 +41,8 @@ class ApiClient
     public const TYPE_PRODUCTS = 'PRODUKTE';
     public const TYPE_PRODUCT_DATA = 'PRODUKTDATEN';
     public const TYPE_AGENCIES = 'AGENTUREN';
+    public const TYPE_PURCHASE_VOUCHER = 'GUTSCHEINPRUEFUNGEINLOESUNG';
+    public const TYPE_PROMO_VOUCHER = 'AKTIONSGUTSCHEIN';
 
     private array $config;
 
@@ -409,6 +413,62 @@ class ApiClient
         return $this->sendRequest(static::TYPE_AGENCIES, $data);
     }
 
+    /**
+     * Validates a purchase voucher by redemption code.
+     *
+     * Purchase vouchers (Gutscheine) have a remaining balance that reduces with each redemption.
+     * They can be regular purchased vouchers or goodwill vouchers (Kulanz).
+     * Returns the voucher with remaining balance, or a Notification if not found or invalid.
+     *
+     * @param string $redemptionCode The voucher redemption code (einloesecode)
+     *
+     * @return Notification|PurchaseVoucher Notification on error, PurchaseVoucher on success
+     *
+     * @throws ApiClientException If the API request fails
+     */
+    public function validatePurchaseVoucher(string $redemptionCode): Notification|PurchaseVoucher
+    {
+        $data = [
+            'user' => $this->config['bpn_username'],
+            'key' => $this->createKey($this->config['bpn_username'], $this->config['bpn_password'], static::TYPE_PURCHASE_VOUCHER),
+            'satz' => ['@typ' => static::TYPE_PURCHASE_VOUCHER],
+            'einloesecode' => $redemptionCode,
+        ];
+
+        return $this->sendRequest(static::TYPE_PURCHASE_VOUCHER, $data);
+    }
+
+    /**
+     * Validates a promo voucher for a specific travel and participant price.
+     *
+     * Promo vouchers (Aktionsgutscheine) provide absolute discounts per person or per booking.
+     * Applicability is indicated by the pro_buchung_person field: "P" = per person, "B" = per booking.
+     *
+     * @param string $promoCode        The promo voucher code
+     * @param int    $travelId         The travel ID this voucher applies to
+     * @param float  $participantPrice Current participant price for validation
+     *
+     * @return Notification|PromoVoucher Notification on error, PromoVoucher on success
+     *
+     * @throws ApiClientException If the API request fails
+     */
+    public function validatePromoVoucher(string $promoCode, int $travelId, float $participantPrice): Notification|PromoVoucher
+    {
+        // Format price to German format (comma decimal separator)
+        $priceFormatted = number_format($participantPrice, 2, ',', '');
+
+        $data = [
+            'user' => $this->config['bpn_username'],
+            'key' => $this->createKey($this->config['bpn_username'], $this->config['bpn_password'], static::TYPE_PROMO_VOUCHER),
+            'satz' => ['@typ' => static::TYPE_PROMO_VOUCHER],
+            'aktionsgutschein' => $promoCode,
+            'idreise' => $travelId,
+            'preis' => $priceFormatted,
+        ];
+
+        return $this->sendRequest(static::TYPE_PROMO_VOUCHER, $data);
+    }
+
     /**
      * @throws ApiClientException
      */
diff --git a/src/BusProNet/DataProcessor/BookingDataProcessor.php b/src/BusProNet/DataProcessor/BookingDataProcessor.php
index c8d275c..ac056ae 100644
--- a/src/BusProNet/DataProcessor/BookingDataProcessor.php
+++ b/src/BusProNet/DataProcessor/BookingDataProcessor.php
@@ -274,6 +274,17 @@ class BookingDataProcessor
         $this->buildServicesPayload($payload, $bookingData);
         $this->buildPickupPayload($payload, $bookingData);
 
+        // Add purchase vouchers if any exist
+        $purchaseVouchers = $this->collectPurchaseVouchers($formData);
+        if (false === empty($purchaseVouchers)) {
+            $payload['gutscheine']['gutschein'] = [];
+            foreach ($purchaseVouchers as $code) {
+                $payload['gutscheine']['gutschein'][] = [
+                    '@einloesecode' => $code,
+                ];
+            }
+        }
+
         return $payload;
     }
 
@@ -676,6 +687,11 @@ class BookingDataProcessor
                         $participantPayload['wünsche'] = $wishes;
                     }
                 }
+
+                // Add promo voucher if present
+                if (null !== $dto->promoVoucherCode && '' !== trim($dto->promoVoucherCode)) {
+                    $participantPayload['aktionscode'] = trim($dto->promoVoucherCode);
+                }
             }
 
             $payload['teilnehmerliste']['teilnehmer'][] = $participantPayload;
@@ -867,6 +883,11 @@ class BookingDataProcessor
                 }
             }
 
+            // Add promo voucher if present
+            if (null !== $participant->promoVoucherCode && '' !== trim($participant->promoVoucherCode)) {
+                $participantData['aktionscode'] = trim($participant->promoVoucherCode);
+            }
+
             $payload['teilnehmerliste']['teilnehmer'][] = $participantData;
         }
 
@@ -884,6 +905,17 @@ class BookingDataProcessor
         $this->addServicesFromMap($payload, 'zustiege', 'zustieg', '@idzustieg', $pickupMap);
         $this->addServicesFromMap($payload, 'versicherungen', 'versicherung', '@idversicherung', $insuranceMap);
 
+        // Add purchase vouchers if any exist
+        $purchaseVouchers = $this->collectPurchaseVouchers($bookingDto);
+        if (false === empty($purchaseVouchers)) {
+            $payload['gutscheine']['gutschein'] = [];
+            foreach ($purchaseVouchers as $code) {
+                $payload['gutscheine']['gutschein'][] = [
+                    '@einloesecode' => $code,
+                ];
+            }
+        }
+
         // Add payment information
         $payload['zahlung'] = [
             '@idzahlungsart' => Constants::PAYMENT_METHOD_DEBIT === $bookingDto->paymentMethod
@@ -1131,6 +1163,28 @@ class BookingDataProcessor
         return $insuranceMap;
     }
 
+    /**
+     * Collects all purchase vouchers from participants.
+     *
+     * Removes duplicates and empty values, returning unique redemption codes
+     * for aggregation into the <gutscheine> collection in the booking payload.
+     *
+     * @return string[] Array of unique redemption codes
+     */
+    private function collectPurchaseVouchers(BookingDto $bookingDto): array
+    {
+        $vouchers = [];
+
+        foreach ($bookingDto->participants as $participant) {
+            if (null !== $participant->purchaseVoucherCode && '' !== trim($participant->purchaseVoucherCode)) {
+                $vouchers[] = trim($participant->purchaseVoucherCode);
+            }
+        }
+
+        // Remove duplicates (in case multiple participants enter same code)
+        return array_unique($vouchers);
+    }
+
     /**
      * Applies bulk insurance assignment if the applicant has enabled it.
      *
diff --git a/src/BusProNet/Model/PromoVoucher.php b/src/BusProNet/Model/PromoVoucher.php
new file mode 100644
index 0000000..d7e70c7
--- /dev/null
+++ b/src/BusProNet/Model/PromoVoucher.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\BusProNet\Model;
+
+/**
+ * Promo voucher validation response from BPN API.
+ *
+ * Represents a validated promotional voucher (Aktionsgutschein) applied per participant.
+ * These vouchers provide discounts either as fixed amounts or percentages.
+ */
+final readonly class PromoVoucher
+{
+    public const APPLICABILITY_PER_PERSON = 'P';
+    public const APPLICABILITY_PER_BOOKING = 'B';
+
+    public function __construct(
+        public string $code,
+        public string $description,
+        public string $applicability,
+        public float $discountAmount,
+        public float $discountPercentage,
+        public float $minimumPrice,
+    ) {
+    }
+
+    public function isPerPerson(): bool
+    {
+        return self::APPLICABILITY_PER_PERSON === $this->applicability;
+    }
+
+    public function isPerBooking(): bool
+    {
+        return self::APPLICABILITY_PER_BOOKING === $this->applicability;
+    }
+}
diff --git a/src/BusProNet/Model/PromoVoucherValidationResult.php b/src/BusProNet/Model/PromoVoucherValidationResult.php
new file mode 100644
index 0000000..a61a44e
--- /dev/null
+++ b/src/BusProNet/Model/PromoVoucherValidationResult.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\BusProNet\Model;
+
+final readonly class PromoVoucherValidationResult
+{
+    public function __construct(
+        public bool $isValid,
+        public ?PromoVoucher $voucher = null,
+        public ?string $errorMessage = null,
+        public ?int $errorCode = null,
+    ) {
+    }
+}
diff --git a/src/BusProNet/Model/PurchaseVoucher.php b/src/BusProNet/Model/PurchaseVoucher.php
new file mode 100644
index 0000000..47c9690
--- /dev/null
+++ b/src/BusProNet/Model/PurchaseVoucher.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\BusProNet\Model;
+
+/**
+ * Purchase voucher validation response from BPN API.
+ *
+ * Represents a validated purchase voucher (Gutschein) with redemption code.
+ * These vouchers have a remaining balance that can be redeemed against bookings.
+ * The voucher reduces the booking price by its balance until depleted.
+ *
+ * Purchase vouchers can be regular purchased vouchers or goodwill vouchers (Kulanz)
+ * issued to customers for complaints or other reasons.
+ */
+final readonly class PurchaseVoucher
+{
+    public function __construct(
+        public string $voucherNumber,
+        public string $redemptionCode,
+        public int $voucherId,
+        public float $remainingBalance,
+        public string $type,
+    ) {
+    }
+}
diff --git a/src/BusProNet/Model/PurchaseVoucherValidationResult.php b/src/BusProNet/Model/PurchaseVoucherValidationResult.php
new file mode 100644
index 0000000..02ce4a0
--- /dev/null
+++ b/src/BusProNet/Model/PurchaseVoucherValidationResult.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\BusProNet\Model;
+
+final readonly class PurchaseVoucherValidationResult
+{
+    public function __construct(
+        public bool $isValid,
+        public ?PurchaseVoucher $voucher = null,
+        public ?string $errorMessage = null,
+        public ?int $errorCode = null,
+    ) {
+    }
+}
diff --git a/src/BusProNet/XmlParser/ApiResponseParser.php b/src/BusProNet/XmlParser/ApiResponseParser.php
index b088eac..220bb76 100644
--- a/src/BusProNet/XmlParser/ApiResponseParser.php
+++ b/src/BusProNet/XmlParser/ApiResponseParser.php
@@ -69,6 +69,10 @@ class ApiResponseParser extends AbstractParser
                 return (new TravelParser())->parse($travelNode->first(), ...$additionalArgs);
             case ApiClient::TYPE_AGENCIES:
                 return (new AgencyParser())->parse($resultNode);
+            case ApiClient::TYPE_PURCHASE_VOUCHER:
+                return (new PurchaseVoucherParser())->parse($resultNode);
+            case ApiClient::TYPE_PROMO_VOUCHER:
+                return (new PromoVoucherParser())->parse($resultNode);
         }
 
         throw new ResponseParserException('Unable to parse XML response');
diff --git a/src/BusProNet/XmlParser/PromoVoucherParser.php b/src/BusProNet/XmlParser/PromoVoucherParser.php
new file mode 100644
index 0000000..d68be54
--- /dev/null
+++ b/src/BusProNet/XmlParser/PromoVoucherParser.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\BusProNet\XmlParser;
+
+use App\BusProNet\Model\PromoVoucher;
+use Symfony\Component\DomCrawler\Crawler;
+
+final class PromoVoucherParser extends AbstractParser
+{
+    public function parse(Crawler $node): PromoVoucher
+    {
+        $voucherNode = $node->filterXPath('//aktionsgutschein');
+
+        $code = trim($voucherNode->attr('code') ?? '');
+        $description = trim($voucherNode->attr('text') ?? '');
+        $applicability = $voucherNode->attr('pro_buchung_person') ?? '';
+        $discountAmount = $this->stringToFloat($voucherNode->attr('wert_betrag') ?? '0,00');
+        $discountPercentage = $this->stringToFloat($voucherNode->attr('wert_prozent') ?? '0,00');
+        $minimumPrice = $this->stringToFloat($voucherNode->attr('ab_preis') ?? '0,00');
+
+        return new PromoVoucher(
+            code: $code,
+            description: $description,
+            applicability: $applicability,
+            discountAmount: $discountAmount,
+            discountPercentage: $discountPercentage,
+            minimumPrice: $minimumPrice
+        );
+    }
+}
diff --git a/src/BusProNet/XmlParser/PurchaseVoucherParser.php b/src/BusProNet/XmlParser/PurchaseVoucherParser.php
new file mode 100644
index 0000000..8dd723e
--- /dev/null
+++ b/src/BusProNet/XmlParser/PurchaseVoucherParser.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\BusProNet\XmlParser;
+
+use App\BusProNet\Model\PurchaseVoucher;
+use Symfony\Component\DomCrawler\Crawler;
+
+final class PurchaseVoucherParser extends AbstractParser
+{
+    public function parse(Crawler $node): PurchaseVoucher
+    {
+        $voucherNode = $node->filterXPath('//gutschein');
+
+        $voucherNumber = $this->getStringOrNullValue($voucherNode->filterXPath('//gutscheinnnr')) ?? '';
+        $redemptionCode = $this->getStringOrNullValue($voucherNode->filterXPath('//einloesecode')) ?? '';
+        $voucherId = $this->getIntOrNullValue($voucherNode->filterXPath('//idgutschein')) ?? 0;
+        $remainingBalance = $this->getFloatOrNullValue($voucherNode->filterXPath('//betrag')) ?? 0.0;
+        $type = $this->getStringOrNullValue($voucherNode->filterXPath('//art')) ?? '';
+
+        return new PurchaseVoucher(
+            voucherNumber: $voucherNumber,
+            redemptionCode: $redemptionCode,
+            voucherId: $voucherId,
+            remainingBalance: $remainingBalance,
+            type: $type
+        );
+    }
+}
diff --git a/src/Controller/Booking/Create/Step3Controller.php b/src/Controller/Booking/Create/Step3Controller.php
index 2b1d1a0..cd98f59 100644
--- a/src/Controller/Booking/Create/Step3Controller.php
+++ b/src/Controller/Booking/Create/Step3Controller.php
@@ -12,6 +12,7 @@ use App\Controller\Booking\Traits\BookingExceptionHandlerTrait;
 use App\Form\BookingCreateStep3Type;
 use App\Form\Model\BookingDto;
 use App\Htmx\HxTrait;
+use App\Service\BookingPriceCalculatorService;
 use App\Service\BookingService;
 use App\Service\BookingSummaryDataService;
 use Psr\Log\LoggerInterface;
@@ -33,6 +34,7 @@ class Step3Controller extends AbstractController
     public function __construct(
         private readonly BookingService $bookingService,
         private readonly BookingSummaryDataService $summaryDataService,
+        private readonly BookingPriceCalculatorService $priceCalculator,
         private readonly ApiClient $apiClient,
         private readonly LoggerInterface $logger,
     ) {
diff --git a/src/Form/BookingParticipantType.php b/src/Form/BookingParticipantType.php
index f258ebf..7d3f9b7 100644
--- a/src/Form/BookingParticipantType.php
+++ b/src/Form/BookingParticipantType.php
@@ -312,10 +312,12 @@ class BookingParticipantType extends AbstractType
             'licensePlate' => TextType::class,
         ];
 
-        // Insurance fields only available in create mode (API limitation)
+        // Insurance and voucher fields only available in create mode
         if (BookingDto::MODE_CREATE === $bookingDto->getMode()) {
             $dynamicFields['bulkInsuranceBooking'] = CheckboxType::class;
             $dynamicFields['insurance'] = ChoiceType::class;
+            $dynamicFields['purchaseVoucherCode'] = TextType::class;
+            $dynamicFields['promoVoucherCode'] = TextType::class;
         }
 
         foreach ($dynamicFields as $fieldName => $fieldType) {
diff --git a/src/Form/Model/ParticipantDto.php b/src/Form/Model/ParticipantDto.php
index 7a31195..fc25acb 100644
--- a/src/Form/Model/ParticipantDto.php
+++ b/src/Form/Model/ParticipantDto.php
@@ -33,6 +33,8 @@ class ParticipantDto
         'licensePlate',
         'bulkInsuranceBooking',
         'insurance',
+        'purchaseVoucherCode',
+        'promoVoucherCode',
     ];
 
     public ?int $index = null;
@@ -111,6 +113,34 @@ class ParticipantDto
     // Bulk insurance booking flag (applicant only: when checked, assigns same insurance type to all participants)
     public bool $bulkInsuranceBooking = false;
 
+    /**
+     * Purchase voucher redemption code.
+     * Collected from all participants and aggregated into single <gutscheine> collection in booking payload.
+     */
+    #[Assert\Length(
+        max: 50,
+        maxMessage: 'Der Gutscheincode darf maximal {{ limit }} Zeichen lang sein'
+    )]
+    #[Assert\Regex(
+        pattern: '/^[A-Za-z0-9\-]+$/',
+        message: 'Der Gutscheincode darf nur Buchstaben, Zahlen und Bindestriche enthalten'
+    )]
+    public ?string $purchaseVoucherCode = null;
+
+    /**
+     * Promo voucher code.
+     * Applied per participant in booking payload as <aktionscode>.
+     */
+    #[Assert\Length(
+        max: 50,
+        maxMessage: 'Der Aktionscode darf maximal {{ limit }} Zeichen lang sein'
+    )]
+    #[Assert\Regex(
+        pattern: '/^[A-Za-z0-9\-]+$/',
+        message: 'Der Aktionscode darf nur Buchstaben, Zahlen und Bindestriche enthalten'
+    )]
+    public ?string $promoVoucherCode = null;
+
     /**
      * @var array<array{type: string, message: string}> Notification messages for user feedback
      */
diff --git a/src/Form/Service/CreateFieldStateProvider.php b/src/Form/Service/CreateFieldStateProvider.php
index 8ac3a58..c9098bc 100644
--- a/src/Form/Service/CreateFieldStateProvider.php
+++ b/src/Form/Service/CreateFieldStateProvider.php
@@ -267,6 +267,10 @@ class CreateFieldStateProvider extends AbstractFieldStateProvider
             'static_text' => new SingleRoomTypeCondition(),
         ];
 
+        // Voucher fields (purchaseVoucherCode, promoVoucherCode) have no state conditions
+        // They are enabled by default for all participants in create mode
+        // No visibility rules - always shown to allow optional voucher entry
+
         // Example field state conditions would be registered here
         // For demonstration purposes, here are some example patterns:
 
diff --git a/src/Form/Service/ParticipantFieldOptionsProvider.php b/src/Form/Service/ParticipantFieldOptionsProvider.php
index f5331e9..4bfad1c 100644
--- a/src/Form/Service/ParticipantFieldOptionsProvider.php
+++ b/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) => [
diff --git a/src/Form/Service/ParticipantPromoVoucherFieldHandler.php b/src/Form/Service/ParticipantPromoVoucherFieldHandler.php
new file mode 100644
index 0000000..f1dd238
--- /dev/null
+++ b/src/Form/Service/ParticipantPromoVoucherFieldHandler.php
@@ -0,0 +1,123 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
+use App\Service\BookingPriceCalculatorService;
+use App\Service\VoucherValidationService;
+
+/**
+ * Handles processing and validation of promotional voucher codes for booking participants.
+ *
+ * This handler validates promo vouchers via the BPN API and provides immediate feedback
+ * about voucher validity, discount amounts, and applicability. Promo vouchers can be
+ * applied per person or per booking, using absolute discount amounts (never percentages).
+ *
+ * Validation includes:
+ * - Code validity check
+ * - Travel applicability verification
+ * - Minimum price threshold validation
+ * - Real-time API validation with 15-minute caching
+ *
+ * Dependencies: ALL price-affecting fields (insurance, services, ski pass, rentals, etc.)
+ * since promo validation requires accurate participant pricing.
+ */
+class ParticipantPromoVoucherFieldHandler extends AbstractParticipantFieldHandler
+{
+    public function __construct(
+        private readonly VoucherValidationService $voucherValidationService,
+        private readonly BookingPriceCalculatorService $priceCalculatorService,
+    ) {
+    }
+
+    public function getFieldName(): string
+    {
+        return 'promoVoucherCode';
+    }
+
+    public function getDependencies(): array
+    {
+        // CRITICAL: Must run after ALL price-affecting handlers to ensure accurate pricing
+        return [
+            'dateOfBirth',              // Required for age-based services
+            'skiPass',                  // Affects travel price
+            'rentals',                  // Affects travel price
+            'courses',                  // Affects travel price
+            'additionalServices',       // Affects travel price
+            'board',                    // Affects travel price
+            'transportationOutbound',   // Affects travel price
+            'transportationInbound',    // Affects travel price
+            'pickup',                   // Affects travel price
+            'parking',                  // Affects travel price
+            'insurance',                // Affects travel price (must be last)
+        ];
+    }
+
+    public function shouldProcess(array $submittedData, string $mode, int $participantIndex): bool
+    {
+        $promoCode = $this->getFieldValue($submittedData, $this->getFieldName());
+
+        return null !== $promoCode && '' !== trim($promoCode);
+    }
+
+    public function processField(array $submittedData, BookingDto $bookingDto, int $participantIndex): void
+    {
+        $participant = $this->getParticipant($bookingDto, $participantIndex);
+
+        if (null === $participant) {
+            return;
+        }
+
+        $promoCode = $this->getFieldValue($submittedData, $this->getFieldName());
+
+        if (null === $promoCode || '' === trim($promoCode)) {
+            return;
+        }
+
+        // Calculate participant's current price including all services
+        $participantPrice = $this->priceCalculatorService->calculateIndividualParticipantPrice(
+            $bookingDto,
+            $participantIndex
+        );
+
+        // Get travel ID for validation
+        $travelId = $bookingDto->travel->id;
+
+        if (null === $travelId) {
+            $participant->addNotification(
+                'error',
+                'Aktionscode konnte nicht validiert werden: Reise-ID fehlt.'
+            );
+
+            return;
+        }
+
+        // Validate promo voucher via API
+        $result = $this->voucherValidationService->validatePromoVoucher(
+            $promoCode,
+            $travelId,
+            $participantPrice
+        );
+
+        if (true === $result->isValid && null !== $result->voucher) {
+            $applicability = $result->voucher->isPerPerson() ? 'je Person' : 'pro Buchung';
+            $participant->addNotification(
+                'success',
+                sprintf(
+                    'Aktionscode gültig: %s (Rabatt: %.2f € %s)',
+                    $result->voucher->description,
+                    $result->voucher->discountAmount,
+                    $applicability
+                )
+            );
+        } else {
+            $participant->addNotification(
+                'error',
+                sprintf('Aktionscode ungültig: %s', $result->errorMessage ?? 'Unbekannter Fehler')
+            );
+        }
+    }
+}
diff --git a/src/Form/Service/ParticipantPurchaseVoucherFieldHandler.php b/src/Form/Service/ParticipantPurchaseVoucherFieldHandler.php
new file mode 100644
index 0000000..b6ab80d
--- /dev/null
+++ b/src/Form/Service/ParticipantPurchaseVoucherFieldHandler.php
@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
+use App\Service\VoucherValidationService;
+
+/**
+ * Handles processing and validation of purchase voucher codes for booking participants.
+ *
+ * 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
+ *
+ * Dependencies: None (purchase vouchers don't require price calculation)
+ */
+class ParticipantPurchaseVoucherFieldHandler extends AbstractParticipantFieldHandler
+{
+    public function __construct(
+        private readonly VoucherValidationService $voucherValidationService,
+    ) {
+    }
+
+    public function getFieldName(): string
+    {
+        return 'purchaseVoucherCode';
+    }
+
+    public function getDependencies(): array
+    {
+        // No dependencies - purchase vouchers don't require price calculation
+        return [];
+    }
+
+    public function shouldProcess(array $submittedData, string $mode, int $participantIndex): bool
+    {
+        $voucherCode = $this->getFieldValue($submittedData, $this->getFieldName());
+
+        return null !== $voucherCode && '' !== trim($voucherCode);
+    }
+
+    public function processField(array $submittedData, BookingDto $bookingDto, int $participantIndex): void
+    {
+        $participant = $this->getParticipant($bookingDto, $participantIndex);
+
+        if (null === $participant) {
+            return;
+        }
+
+        $voucherCode = $this->getFieldValue($submittedData, $this->getFieldName());
+
+        if (null === $voucherCode || '' === trim($voucherCode)) {
+            return;
+        }
+
+        // Validate voucher via API
+        $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')
+            );
+        }
+    }
+}
diff --git a/src/Service/BookingService.php b/src/Service/BookingService.php
index 33a76bb..e69e924 100644
--- a/src/Service/BookingService.php
+++ b/src/Service/BookingService.php
@@ -2,6 +2,7 @@
 
 namespace App\Service;
 
+use App\BusProNet\Constants;
 use App\BusProNet\Model\Room;
 use App\BusProNet\Model\Travel;
 use App\Exception\BookingNotPossibleException;
@@ -221,7 +222,7 @@ class BookingService
         // For inquiry bookings with 0 availability, get all rooms ignoring availability count
         if ($isInquiryBooking && empty($availableRooms)) {
             $availableRooms = array_filter($travelData->rooms, function (Room $room) {
-                return \App\BusProNet\Constants::STATUS_AVAILABLE === $room->status;
+                return Constants::STATUS_AVAILABLE === $room->status;
             });
         }
 
@@ -443,7 +444,7 @@ class BookingService
      */
     public function preselectMandatoryServices(BookingDto $bookingDto): void
     {
-        $additionalServices = $bookingDto->travel->getAdditionalServicesBySubTypes(\App\BusProNet\Constants::TOKEN_ADDITIONAL);
+        $additionalServices = $bookingDto->travel->getAdditionalServicesBySubTypes(Constants::TOKEN_ADDITIONAL);
         $mandatoryServices = array_filter($additionalServices, fn ($service) => true === $service->mandatory);
 
         // Pre-select mandatory services for each participant
diff --git a/src/Service/BookingSummaryDataService.php b/src/Service/BookingSummaryDataService.php
new file mode 100644
index 0000000..15e34b7
--- /dev/null
+++ b/src/Service/BookingSummaryDataService.php
@@ -0,0 +1,139 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\Form\Model\BookingDto;
+use Psr\Log\LoggerInterface;
+use Symfony\Contracts\Cache\CacheInterface;
+use Symfony\Contracts\Cache\ItemInterface;
+
+/**
+ * Consolidates all booking summary data for display in sidebars.
+ *
+ * Provides pricing breakdowns, room assignments, participant counts,
+ * and CMS product information in a single service.
+ */
+class BookingSummaryDataService
+{
+    public function __construct(
+        private readonly BookingPriceCalculatorService $priceCalculator,
+        private readonly CmsDataService $cmsDataService,
+        private readonly CacheInterface $cache,
+        private readonly LoggerInterface $logger,
+    ) {
+    }
+
+    /**
+     * Get complete summary data for booking sidebar.
+     *
+     * @return array{
+     *     selectedRooms: array,
+     *     participantCount: int,
+     *     totalPrice: string,
+     *     groupedSelectedRooms: array,
+     *     assignmentCounts: array,
+     *     pricingData: array,
+     *     cmsData: array|null
+     * }
+     */
+    public function getSummaryData(BookingDto $bookingDto): array
+    {
+        // Get selected rooms (for Step1 controller compatibility)
+        $selectedRooms = $bookingDto->getSelectedRooms();
+
+        // Calculate individual prices for all participants
+        $participantPrices = $this->priceCalculator->calculateAllParticipantIndividualPrices($bookingDto);
+
+        // Calculate total price
+        $totalPrice = array_sum($participantPrices);
+
+        // Get room assignment counts
+        $roomCounts = [];
+        foreach ($bookingDto->participants as $participant) {
+            if (null !== $participant->assignedRoomId) {
+                $roomCounts[$participant->assignedRoomId] = ($roomCounts[$participant->assignedRoomId] ?? 0) + 1;
+            }
+        }
+
+        // Group selected rooms with counts
+        $groupedSelectedRooms = [];
+        foreach ($roomCounts as $roomId => $count) {
+            $room = $bookingDto->travel->getRoomById($roomId);
+            if (null !== $room) {
+                $groupedSelectedRooms[] = [
+                    'room' => $room,
+                    'count' => $count,
+                ];
+            }
+        }
+
+        // Get detailed pricing breakdown
+        $pricingData = $this->priceCalculator->getPricingBreakdown($bookingDto);
+
+        // Fetch CMS data (images, etc.)
+        $cmsData = $this->getCmsData($bookingDto);
+
+        return [
+            'selectedRooms' => $selectedRooms,
+            'participantCount' => count($bookingDto->participants),
+            'totalPrice' => number_format($totalPrice, 2, ',', '.').' €',
+            'groupedSelectedRooms' => $groupedSelectedRooms,
+            'assignmentCounts' => $roomCounts,
+            'pricingData' => $pricingData,
+            'cmsData' => $cmsData,
+        ];
+    }
+
+    /**
+     * Fetches CMS data for the product and hotel in the booking.
+     *
+     * Data is cached for 1 hour as it rarely changes. Returns null
+     * if the API call fails or if product/hotel codes are not available.
+     */
+    private function getCmsData(BookingDto $bookingDto): ?array
+    {
+        $productCode = $bookingDto->travel->productCode;
+        $hotelCode = $bookingDto->travel->hotel?->code;
+
+        if (null === $productCode) {
+            $this->logger->debug('Cannot fetch CMS data: product code is not available', [
+                'travel_id' => $bookingDto->travel->id,
+            ]);
+
+            return null;
+        }
+
+        $cacheKey = sprintf('cms_data.%s.%s', $productCode, $hotelCode ?? 'none');
+
+        try {
+            return $this->cache->get($cacheKey, function (ItemInterface $item) use ($productCode, $hotelCode) {
+                $item->expiresAfter(3600); // 1 hour
+
+                $result = $this->cmsDataService->getProductDetails($productCode, $hotelCode);
+
+                // Return null if API call failed
+                if (true === isset($result['success']) && false === $result['success']) {
+                    $this->logger->warning('CMS API call failed', [
+                        'product_code' => $productCode,
+                        'hotel_code' => $hotelCode,
+                        'message' => $result['message'] ?? 'Unknown error',
+                    ]);
+
+                    return null;
+                }
+
+                return $result;
+            });
+        } catch (\Throwable $e) {
+            $this->logger->error('Failed to fetch CMS data', [
+                'product_code' => $productCode,
+                'hotel_code' => $hotelCode,
+                'exception' => $e->getMessage(),
+            ]);
+
+            return null;
+        }
+    }
+}
diff --git a/src/Service/VoucherValidationService.php b/src/Service/VoucherValidationService.php
new file mode 100644
index 0000000..7240744
--- /dev/null
+++ b/src/Service/VoucherValidationService.php
@@ -0,0 +1,131 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\BusProNet\ApiClient;
+use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Model\Notification;
+use App\BusProNet\Model\PromoVoucherValidationResult;
+use App\BusProNet\Model\PurchaseVoucherValidationResult;
+use Psr\Log\LoggerInterface;
+use Symfony\Contracts\Cache\CacheInterface;
+use Symfony\Contracts\Cache\ItemInterface;
+
+class VoucherValidationService
+{
+    private const CACHE_TTL = 900; // 15 minutes
+
+    public function __construct(
+        private readonly ApiClient $apiClient,
+        private readonly CacheInterface $cache,
+        private readonly LoggerInterface $logger,
+    ) {
+    }
+
+    public function validatePurchaseVoucher(
+        string $redemptionCode,
+    ): PurchaseVoucherValidationResult {
+        $cacheKey = sprintf('voucher.purchase.%s', md5($redemptionCode));
+
+        try {
+            return $this->cache->get($cacheKey, function (ItemInterface $item) use ($redemptionCode) {
+                $item->expiresAfter(self::CACHE_TTL);
+
+                try {
+                    $result = $this->apiClient->validatePurchaseVoucher($redemptionCode);
+
+                    if ($result instanceof Notification) {
+                        return new PurchaseVoucherValidationResult(
+                            isValid: false,
+                            errorMessage: $result->message,
+                            errorCode: $result->code
+                        );
+                    }
+
+                    return new PurchaseVoucherValidationResult(
+                        isValid: true,
+                        voucher: $result
+                    );
+                } catch (ApiClientException $e) {
+                    $this->logger->error('Purchase voucher validation failed', [
+                        'redemptionCode' => $redemptionCode,
+                        'error' => $e->getMessage(),
+                    ]);
+
+                    return new PurchaseVoucherValidationResult(
+                        isValid: false,
+                        errorMessage: 'Die Gutschein-Validierung ist fehlgeschlagen.'
+                    );
+                }
+            });
+        } catch (\Exception $e) {
+            $this->logger->error('Cache error during purchase voucher validation', [
+                'error' => $e->getMessage(),
+            ]);
+
+            return new PurchaseVoucherValidationResult(
+                isValid: false,
+                errorMessage: 'Ein technischer Fehler ist aufgetreten.'
+            );
+        }
+    }
+
+    public function validatePromoVoucher(
+        string $promoCode,
+        int $travelId,
+        float $participantPrice,
+    ): PromoVoucherValidationResult {
+        $cacheKey = sprintf(
+            'voucher.promo.%s.%d.%s',
+            md5($promoCode),
+            $travelId,
+            md5((string) $participantPrice)
+        );
+
+        try {
+            return $this->cache->get($cacheKey, function (ItemInterface $item) use ($promoCode, $travelId, $participantPrice) {
+                $item->expiresAfter(self::CACHE_TTL);
+
+                try {
+                    $result = $this->apiClient->validatePromoVoucher($promoCode, $travelId, $participantPrice);
+
+                    if ($result instanceof Notification) {
+                        return new PromoVoucherValidationResult(
+                            isValid: false,
+                            errorMessage: $result->message,
+                            errorCode: $result->code
+                        );
+                    }
+
+                    return new PromoVoucherValidationResult(
+                        isValid: true,
+                        voucher: $result
+                    );
+                } catch (ApiClientException $e) {
+                    $this->logger->error('Promo voucher validation failed', [
+                        'promoCode' => $promoCode,
+                        'travelId' => $travelId,
+                        'participantPrice' => $participantPrice,
+                        'error' => $e->getMessage(),
+                    ]);
+
+                    return new PromoVoucherValidationResult(
+                        isValid: false,
+                        errorMessage: 'Die Aktionscode-Validierung ist fehlgeschlagen.'
+                    );
+                }
+            });
+        } catch (\Exception $e) {
+            $this->logger->error('Cache error during promo voucher validation', [
+                'error' => $e->getMessage(),
+            ]);
+
+            return new PromoVoucherValidationResult(
+                isValid: false,
+                errorMessage: 'Ein technischer Fehler ist aufgetreten.'
+            );
+        }
+    }
+}
diff --git a/templates/booking/_participant_form.html.twig b/templates/booking/_participant_form.html.twig
index 6a881fe..a933582 100644
--- a/templates/booking/_participant_form.html.twig
+++ b/templates/booking/_participant_form.html.twig
@@ -356,6 +356,21 @@
                     </div>
                 </div>
             {% endif %}
+
+            {# Voucher fields - available for all participants regardless of eligibility #}
+            {% if form.purchaseVoucherCode is defined or form.promoVoucherCode is defined %}
+                <div class="mt-6 border-t pt-4">
+                    <h3 class="font-semibold text-lg mb-4">Gutscheine</h3>
+                    <div class="grid grid-cols-2 gap-4">
+                        {% if form.purchaseVoucherCode is defined %}
+                            {{ form_row(form.purchaseVoucherCode) }}
+                        {% endif %}
+                        {% if form.promoVoucherCode is defined %}
+                            {{ form_row(form.promoVoucherCode) }}
+                        {% endif %}
+                    </div>
+                </div>
+            {% endif %}
         </div>
 
     <div class="flex justify-between mt-8">
@@ -390,10 +405,11 @@
     <div id="booking-summary" hx-swap-oob="true">
         {% include 'booking/_summary.html.twig' with {
             'bookingCreateDto': bookingDto,
-            'participantCount': summaryData.participantsCount,
+            'participantCount': summaryData.participantCount,
             'groupedSelectedRooms': summaryData.groupedSelectedRooms,
             'assignmentCounts': summaryData.assignmentCounts,
-            'pricingData': pricingData
+            'pricingData': pricingData,
+            'cmsData': cmsData
         } %}
     </div>
 {% endblock %}