@type t() :: %MollieAPI.Model.SessionLineItem{
  description: String.t(),
  discountAmount: MollieAPI.Model.Amount.t() | nil,
  imageUrl: String.t() | nil,
  productUrl: String.t() | nil,
  quantity: integer(),
  quantityUnit: String.t() | nil,
  sku: String.t() | nil,
  totalAmount: MollieAPI.Model.Amount.t(),
  type: MollieAPI.Model.PaymentLineTypeResponse.t() | nil,
  unitPrice: MollieAPI.Model.Amount.t(),
  vatAmount: MollieAPI.Model.Amount.t() | nil,
  vatRate: String.t() | nil
}