@type t() :: %MollieAPI.Model.UpdateSalesInvoiceRequest{
  discount: MollieAPI.Model.SalesInvoiceDiscount.t() | nil,
  emailDetails: MollieAPI.Model.SalesInvoiceEmailDetails.t() | nil,
  lines: [MollieAPI.Model.SalesInvoiceLineItem.t()] | nil,
  memo: any() | nil,
  paymentDetails: MollieAPI.Model.SalesInvoicePaymentDetails.t() | nil,
  paymentTerm: MollieAPI.Model.SalesInvoicePaymentTerm.t() | nil,
  recipient: MollieAPI.Model.SalesInvoiceRecipient.t() | nil,
  recipientIdentifier: any() | nil,
  status: MollieAPI.Model.SalesInvoiceStatus.t() | nil,
  testmode: boolean() | nil
}