折扣使用相关-DiscountCustomerGetsValue union

折扣值以及如何适用折扣。

可能的类型

• [DiscountAmount](https://shopify.dev/docs/admin-api/graphql/reference/discounts-and-marketing/discountamount)
• [DiscountOnQuantity](https://shopify.dev/docs/admin-api/graphql/reference/discounts-and-marketing/discountonquantity)
• [DiscountPercentage](https://shopify.dev/docs/admin-api/graphql/reference/discounts-and-marketing/discountpercentage)