public function getActiveAddress()
    {
        if (null === $this->getAddresses()) {
            return null;
        }

        if (1 === count($this->getAddresses())) {
            foreach ($this->getAddresses() as $address) {
                return $address;
            }
        }

        if (null === $this->response['active_address']) {
            return null;
        }

        return $this->getAddresses()[$this->response['active_address']];
    }