@type t() :: %StripeElixir.Params.InvoiceCreatePreviewParams{
  automatic_tax: map() | nil,
  currency: String.t() | nil,
  customer: String.t() | nil,
  customer_account: String.t() | nil,
  customer_details: map() | nil,
  discounts: map() | nil,
  expand: [String.t()] | nil,
  invoice_items: [map()] | nil,
  issuer: map() | nil,
  on_behalf_of: map() | nil,
  preview_mode: String.t() | nil,
  schedule: String.t() | nil,
  schedule_details: map() | nil,
  subscription: String.t() | nil,
  subscription_details: map() | nil
}