ECWID-169205 Add PRICE_BOOK discount base

Author: aleksandr-chestnov

src/main/kotlin/com/ecwid/apiclient/v3/dto/order/enums/DiscountBase.kt

@@ -7,5 +7,6 @@ enum class DiscountBase {
 	SHIPPING,
 	ITEM,
 	SUBTOTAL,
-	CUSTOM
+	CUSTOM,
+	PRICE_BOOK
 }

src/test/kotlin/com/ecwid/apiclient/v3/util/OrderUtils.kt

@@ -76,7 +76,8 @@ fun generateTestOrder(): UpdatedOrder {
 			generateTestCustomDiscountInfo(),
 			generateTestItemDiscountInfo(),
 			generateTestShippingDiscountInfo(),
-			generateTestSubtotalDiscountInfo()
+			generateTestSubtotalDiscountInfo(),
+			generateTestPriceBookDiscountInfo()
 		),
 
 		// TODO Pass real discount coupon code when API client will support this
@@ -217,6 +218,14 @@ private fun generateTestSubtotalDiscountInfo() = UpdatedOrder.DiscountInfo(
 	description = "On subtotal discount " + randomAlphanumeric(8)
 )
 
+private fun generateTestPriceBookDiscountInfo() = UpdatedOrder.DiscountInfo(
+	value = randomPrice(),
+	type = randomEnumValue<DiscountType>(),
+	base = DiscountBase.PRICE_BOOK,
+	orderTotal = randomPrice(),
+	description = "Price book discount " + randomAlphanumeric(8)
+)
+
 private fun generateTestOrderItem() = UpdatedOrder.OrderItem(
 	// var id: Int? = null, // TODO readonly
 	// productId = com.ecwid.api.v3.randomId(), // TODO need to pass existing product id