def send(self, to, amount, from_address=None, fee=None):
recipient = {to: amount}<EOL>return self.send_many(recipient, from_address, fee)<EOL>
Send bitcoin from your wallet to a single address.

        :param str to: recipient bitcoin address
        :param int amount: amount to send (in satoshi)
        :param str from_address: specific address to send from (optional)
        :param int fee: transaction fee in satoshi. Must be greater than the default
                        fee (optional).
        :return: an instance of :class:`PaymentResponse` class