feat: implement payment step

src/Form/Model/BankAccountDto.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Model;
+
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * DTO for bank account information used in payment processing.
+ */
+class BankAccountDto
+{
+    #[Assert\NotBlank(message: 'Bitte geben Sie Ihre IBAN ein.')]
+    #[Assert\Iban(message: 'Die eingegebene IBAN ist ungültig.')]
+    public ?string $iban = null;
+
+    #[Assert\NotBlank(message: 'Bitte geben Sie den Kontoinhaber ein.')]
+    #[Assert\Length(
+        min: 2,
+        max: 70,
+        minMessage: 'Der Kontoinhaber muss mindestens {{ limit }} Zeichen lang sein.',
+        maxMessage: 'Der Kontoinhaber darf maximal {{ limit }} Zeichen lang sein.'
+    )]
+    public ?string $accountHolder = null;
+
+    #[Assert\Length(
+        max: 70,
+        maxMessage: 'Der Bankname darf maximal {{ limit }} Zeichen lang sein.'
+    )]
+    public ?string $bankName = null;
+
+    #[Assert\IsTrue(message: 'Bitte akzeptieren Sie das SEPA-Mandat.')]
+    public bool $sepaMandateAccepted = false;
+
+    /**
+     * Returns IBAN formatted with spaces for display (e.g., DE12 3456 7890 1234 5678 90).
+     */
+    public function getFormattedIban(): ?string
+    {
+        if (null === $this->iban) {
+            return null;
+        }
+
+        $cleanIban = $this->getIbanWithoutSpaces();
+
+        return chunk_split($cleanIban, 4, ' ');
+    }
+
+    /**
+     * Returns IBAN without spaces for storage and API submission.
+     */
+    public function getIbanWithoutSpaces(): ?string
+    {
+        if (null === $this->iban) {
+            return null;
+        }
+
+        return (string) preg_replace('/\s+/', '', $this->iban);
+    }
+}

src/Form/Model/BookingCreateDto.php

@@ -2,6 +2,7 @@
 
 namespace App\Form\Model;
 
+use App\BusProNet\Constants;
 use App\BusProNet\Model\Travel;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
@@ -22,6 +23,14 @@ class BookingCreateDto implements BookingDtoInterface
     #[Assert\Valid]
     public array $participants = [];
 
+    #[Assert\Choice(
+        choices: [Constants::PAYMENT_METHOD_TRANSFER, Constants::PAYMENT_METHOD_DEBIT],
+        message: 'Bitte wählen Sie eine gültige Zahlungsart.'
+    )]
+    public ?string $paymentMethod = Constants::PAYMENT_METHOD_TRANSFER;
+
+    public ?BankAccountDto $bankAccount = null;
+
     public function __construct(public Travel $travel, public int $hotelId)
     {
     }
@@ -95,4 +104,41 @@ class BookingCreateDto implements BookingDtoInterface
                 ->addViolation();
         }
     }
+
+    #[Assert\Callback]
+    public function validateBankAccount(ExecutionContextInterface $context): void
+    {
+        if (Constants::PAYMENT_METHOD_DEBIT !== $this->paymentMethod) {
+            return;
+        }
+
+        if (null === $this->bankAccount) {
+            $context->buildViolation('Bitte geben Sie Ihre Bankverbindung an.')
+                ->atPath('bankAccount')
+                ->addViolation();
+
+            return;
+        }
+
+        // Validate IBAN
+        if (null === $this->bankAccount->iban || '' === trim($this->bankAccount->iban)) {
+            $context->buildViolation('Bitte geben Sie Ihre IBAN ein.')
+                ->atPath('bankAccount.iban')
+                ->addViolation();
+        }
+
+        // Validate account holder
+        if (null === $this->bankAccount->accountHolder || '' === trim($this->bankAccount->accountHolder)) {
+            $context->buildViolation('Bitte geben Sie den Kontoinhaber ein.')
+                ->atPath('bankAccount.accountHolder')
+                ->addViolation();
+        }
+
+        // Validate SEPA mandate
+        if (false === $this->bankAccount->sepaMandateAccepted) {
+            $context->buildViolation('Bitte akzeptieren Sie das SEPA-Mandat.')
+                ->atPath('bankAccount.sepaMandateAccepted')
+                ->addViolation();
+        }
+    }
 }

src/Form/Model/ParticipantDto.php

@@ -12,6 +12,28 @@ use Symfony\Component\Validator\Constraints as Assert;
 #[AppAssert\Participant(groups: ['booking_edit', 'booking_create_step_2'])]
 class ParticipantDto
 {
+    /**
+     * List of dynamic participant fields that can be conditionally hidden/shown.
+     */
+    public const DYNAMIC_FIELDS = [
+        'assignedRoomId',
+        'remarksRoom',
+        'courses',
+        'additionalServices',
+        'board',
+        'rentals',
+        'rentalInsurance',
+        'skiPass',
+        'transportationOutbound',
+        'transportationInbound',
+        'pickupOutbound',
+        'pickupInbound',
+        'parking',
+        'licensePlate',
+        'bulkInsuranceBooking',
+        'insurance',
+    ];
+
     public ?int $index = null;
     public ?int $addressId = null;
     public ?int $personId = null;