@type t() :: %BexioApiClient.SalesOrderManagement.Invoice{
  api_reference: String.t() | nil,
  bank_account_id: integer(),
  contact_address: String.t(),
  contact_id: integer() | nil,
  contact_sub_id: integer() | nil,
  currency_id: integer(),
  document_nr: String.t(),
  esr_id: integer(),
  footer: String.t(),
  header: String.t(),
  id: integer(),
  is_valid_from: Date.t(),
  is_valid_to: Date.t(),
  kb_item_status: :draft | :pending | :paid | :partial | :cancelled | :unpaid,
  language_id: integer(),
  mwst_is_net?: boolean(),
  mwst_type: :including | :excluding | :exempt,
  network_link: String.t() | nil,
  payment_type_id: integer(),
  positions:
    [
      BexioApiClient.SalesOrderManagement.PositionDefault.t()
      | BexioApiClient.SalesOrderManagement.PositionDiscount.t()
      | BexioApiClient.SalesOrderManagement.PositionItem.t()
      | BexioApiClient.SalesOrderManagement.PositionPagebreak.t()
      | BexioApiClient.SalesOrderManagement.PositionSubposition.t()
      | BexioApiClient.SalesOrderManagement.PositionSubtotal.t()
      | BexioApiClient.SalesOrderManagement.PositionText.t()
    ]
    | nil,
  project_id: integer() | nil,
  qr_invoice_id: integer(),
  reference: String.t() | nil,
  show_position_taxes?: boolean(),
  taxs: [%{percentage: Decimal.t(), value: Decimal.t()}],
  template_slug: String.t() | nil,
  title: String.t() | nil,
  total: Decimal.t(),
  total_credit_vouchers: Decimal.t(),
  total_gross: Decimal.t(),
  total_net: Decimal.t(),
  total_received_payments: Decimal.t(),
  total_remaining_payments: Decimal.t(),
  total_rounding_difference: float(),
  total_taxes: Decimal.t(),
  updated_at: NaiveDateTime.t(),
  user_id: integer(),
  viewed_by_client_at: NaiveDateTime.t() | nil
}