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class PaypalPayment:
    def pay(self,email,password,destination):
        pass


class BankPayment():
    def pay(self,username,code,iban):
        pass



class PaymentApi():
    def __init__(self,username=None,code=None,email=None,password=None,destination=None):
        self.username = username
        self.code = code
        self.email = email
        self.password = password
        self.destination = destination

        self.paypal = PaypalPayment()
        self.bank = BankPayment()

    def pay(self):
        if self.email is not None:
            self.paypal.pay(self.email,self.password,self.destination)
            return
        if self.username is not None:
            self.bank.pay(self.username,self.code,self.destination)