@type t() :: %MollieAPI.Model.UpdateSubscriptionRequest{
  amount: MollieAPI.Model.Amount.t() | nil,
  description: String.t() | nil,
  interval: String.t() | nil,
  mandateId: String.t() | nil,
  metadata: MollieAPI.Model.Metadata.t() | nil,
  startDate: String.t() | nil,
  testmode: boolean() | nil,
  times: integer() | nil,
  webhookUrl: String.t() | nil
}