'Call PayPal DoDirectPayment method.'

def doDirectPayment(self, params):

    defaults = {'method': 'DoDirectPayment', 'paymentaction': 'Sale'}
    required = L('creditcardtype    acct    expdate    cvv2    ipaddress    firstname    lastname    street    city    state    countrycode    zip    amt')
    nvp_obj = self._fetch(params, required, defaults)
    return (not nvp_obj.flag)
