t() :: %AdyenCheckoutEx.Model.Card{
  cvc: String.t() | nil,
  expiryMonth: String.t(),
  expiryYear: String.t(),
  holderName: String.t(),
  issueNumber: String.t() | nil,
  number: String.t(),
  startMonth: String.t() | nil,
  startYear: String.t() | nil
}