Add CartSale and CartVoucher.

src/DTO/CartInterface.php

@@ -53,5 +53,10 @@ public function getAllItems(): array;
 	 */
 	public function getItems(): array;
 
+	/**
+	 * @return array<int, CartSaleInterface>
+	 */
+	public function getSales(): array;
+
 	public function getRuntimeContext(): CartRuntimeContextInterface;
 }

src/DTO/CartSaleInterface.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Baraja\EcommerceStandard\DTO;
+
+
+interface CartSaleInterface
+{
+	public function getId(): int;
+
+	public function getCart(): CartInterface;
+
+	public function getType(): string;
+
+	/**
+	 * @return numeric-string
+	 */
+	public function getValue(): string;
+
+	public function getVoucher(): ?CartVoucherInterface;
+
+	public function setVoucher(?CartVoucherInterface $voucher): void;
+}

src/DTO/CartVoucherInterface.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Baraja\EcommerceStandard\DTO;
+
+
+interface CartVoucherInterface
+{
+	public function getId(): int;
+
+	public function getType(): string;
+
+	/**
+	 * @return numeric-string
+	 */
+	public function getValue(): string;
+}