feat: finalize voucher handling and discount display in summary and overview

src/BusProNet/Model/PaymentTerms.php

@@ -6,14 +6,33 @@ namespace App\BusProNet\Model;
 
 /**
  * Represents payment terms from the booking response.
+ *
+ * Contains deposit/final payment details and any applied purchase vouchers.
  */
 class PaymentTerms
 {
+    /**
+     * @param array<array{nummer: string, betrag: float}> $appliedPurchaseVouchers
+     */
     public function __construct(
         public readonly ?float $depositAmount = null,
         public readonly ?string $depositDate = null,
         public readonly ?float $finalPaymentAmount = null,
         public readonly ?string $finalPaymentDate = null,
+        public readonly array $appliedPurchaseVouchers = [],
     ) {
     }
+
+    /**
+     * Gets the total discount from purchase vouchers.
+     */
+    public function getPurchaseVoucherDiscount(): float
+    {
+        $total = 0.0;
+        foreach ($this->appliedPurchaseVouchers as $voucher) {
+            $total += $voucher['betrag'];
+        }
+
+        return round($total, 2);
+    }
 }