Add unitPrice and unitCost properties to Product

src/Models/Product.php

@@ -19,6 +19,8 @@ class Product
     protected ?array $prices = null;
     /** @var Price[]|null */
     protected ?array $costs = null;
+    protected ?Price $unitPrice = null;
+    protected ?Price $unitCost = null;
     protected ?Period $billingPeriod = null;
     protected ?Period $subscriptionPeriod = null;
     protected ?string $billingModel = null;
@@ -103,6 +105,22 @@ public function getCosts(): ?array
         return $this->costs;
     }
 
+    /**
+     * @return Price|null
+     */
+    public function getUnitPrice(): ?Price
+    {
+        return $this->unitPrice;
+    }
+
+    /**
+     * @return Price|null
+     */
+    public function getUnitCost(): ?Price
+    {
+        return $this->unitCost;
+    }
+
     /**
      * @return Period|null
      */
@@ -247,6 +265,30 @@ public function setCosts(?array $costs): self
         return $this;
     }
 
+    /**
+     * @param Price|null $unitPrice
+     *
+     * @return self
+     */
+    public function setUnitPrice(?Price $unitPrice): self
+    {
+        $this->unitPrice = $unitPrice;
+
+        return $this;
+    }
+
+    /**
+     * @param Price|null $unitCost
+     *
+     * @return self
+     */
+    public function setUnitCost(?Price $unitCost): self
+    {
+        $this->unitCost = $unitCost;
+
+        return $this;
+    }
+
     /**
      * @param Period|null $billingPeriod
      *