order_item_type() ::
  :PRODUCT
  | :SERVICE
  | :SHIPPING_FEE
  | :PAYMENT_FEE
  | :DISCOUNT
  | :VALUE_CODE
  | :OTHER

t() :: %SwedbankpayCheckout.Client.Psp.PaymentOrders.PostRequest.OrderItem{
  amount: integer(),
  class: String.t(),
  description: String.t() | nil,
  discount_description: String.t() | nil,
  discount_price: integer() | nil,
  image_url: String.t() | nil,
  item_url: String.t() | nil,
  name: String.t(),
  quantity: integer(),
  quantity_unit: String.t(),
  reference: String.t(),
  type: order_item_type(),
  unit_price: integer(),
  vat_amount: integer(),
  vat_percent: integer()
}