Nested struct within the parent resource.
Summary
Types
@type t() :: %Stripe.Resources.PromotionCode.Promotion{ coupon: String.t() | Stripe.Resources.Coupon.t() | nil, type: String.t() | nil }
coupon- If promotiontypeiscoupon, the coupon for this promotion. Nullable.type- The type of promotion. Possible values:coupon.