module Payment
  class Payment
    attr_reader amount: BigDecimal
    attr_reader currency: String
    attr_reader id: String
  end

  class Customer
    attr_reader id: Integer
    attr_reader name: String
    attr_reader email: String
  end

  class Card
    attr_reader number: String
    attr_reader expiry: String
    attr_reader ccv: String
  end

  class Base
    def self.charge_from_card: (Payment, Customer, Card, bool, bool?) -> Hash
    def self.cancel_transaction: (Payment, bool) -> Hash
    def self.refund_money: (Payment) -> Hash
  end
end