Card constructor 
    
    
    
  Implementation
  @JsonSerializable(explicitToJson: true)
const factory Card({
  /// The brand associated to the card e.g. (visa, amex).
  String? brand,
  /// Two letter iso code.
  String? country,
  /// four digit number representing the year of expiry of the card.
  int? expYear,
  /// two digit number representing the month of expire of the card.
  int? expMonth,
  /// card funding type e.g. (credit, debit).
  String? funding,
  /// last four digits of the card.
  String? last4,
  /// The preffered card brand for payment
  String? preferredNetwork,
  /// The available networks the card can run.
  List<String>? availableNetworks,
  /// Three 3ds usage data.
  ThreeDSecureUsage? threeDSecureUsage,
}) = _Card;