@type t() :: %PolarExpress.Schemas.DiscountUpdate{
  amount: term(),
  amounts: term(),
  basis_points: term(),
  code: term(),
  currency: term(),
  duration: term(),
  duration_in_months: term(),
  ends_at: term(),
  max_redemptions: term(),
  metadata: term(),
  name: term(),
  products: term(),
  starts_at: term(),
  type: term()
}

• amount - Nullable. Deprecated.
• amounts - Nullable.
• basis_points - Nullable.
• code - Code customers can use to apply the discount during checkout. Must be between 3 and 256 characters long and contain only alphanumeric characters.If not provided, the discount can only be applied via the API. Nullable.
• currency - Nullable. Deprecated.
• duration - Nullable.
• duration_in_months - Nullable.
• ends_at - Optional timestamp after which the discount is no longer redeemable. Nullable.
• max_redemptions - Optional maximum number of times the discount can be redeemed. Nullable.
• metadata - Key-value object allowing you to store additional information.

The key must be a string with a maximum length of 40 characters. The value must be either:

• A string with a maximum length of 500 characters
• An integer
• A floating-point number
• A boolean

You can store up to 50 key-value pairs.

• name - Nullable.
• products - Nullable.
• starts_at - Optional timestamp after which the discount is redeemable. Nullable.
• type - Nullable.