Merge pull request #456 from Ecwid/ECWID-156302

ECWID-156302 - Payment methods: customers can't pay for orders using different methods

Author: danyaRedin

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

@@ -4,5 +4,8 @@ enum class DiscountBase {
 	ON_TOTAL,
 	ON_MEMBERSHIP,
 	ON_TOTAL_AND_MEMBERSHIP,
+	SHIPPING,
+	ITEM,
+	SUBTOTAL,
 	CUSTOM
 }