挑选折扣适用国家-DiscountShippingDestinationSelection union

选择此折扣适用的运输国家。

可能的类型

• [DiscountCountries](https://shopify.dev/docs/admin-api/graphql/reference/discounts-and-marketing/discountcountries)
• [DiscountCountryAll](https://shopify.dev/docs/admin-api/graphql/reference/discounts-and-marketing/discountcountryall)