@type t() :: %PolarExpress.Schemas.RefundCreate{
  amount: integer() | nil,
  comment: String.t() | nil,
  metadata:
    %{
      required(String.t()) => String.t() | integer() | float() | boolean() | nil
    }
    | nil,
  order_id: String.t() | nil,
  reason: PolarExpress.Schemas.RefundReason.t() | nil,
  revoke_benefits: boolean() | nil
}

• amount - Amount to refund in cents. Minimum is 1.
• comment - An internal comment about the refund. 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.

• order_id - Format: uuid4.
• reason
• revoke_benefits - Should this refund trigger the associated customer benefits to be revoked?

Note: Only allowed in case the order is a one-time purchase. Subscriptions automatically revoke customer benefits once the subscription itself is revoked, i.e fully canceled.