class BillingException(Exception):
    pass


class InsufficientCreditsError(BillingException):
    pass


class InvalidVoucherCodeError(BillingException):
    pass


class PaymentError(BillingException):
    pass


class InvalidAmountError(BillingException):
    pass


class CreateOrderError(BillingException):
    pass


class CheckoutOrderError(BillingException):
    pass


class StripeException(BillingException):
    pass


class StripeAttachPaymentMethodError(StripeException):
    pass