public function isActive()
    {
        if ($this->_isActive === null) {
            //Checkbox for active Login checked
            $this->_isActive = (
                (bool)$this->getConfig()->getConfigParam('blAmazonLoginActive') === true
                && (string)$this->getConfig()->getConfigParam('sAmazonLoginClientId') !== ''
                && (string)$this->getConfig()->getConfigParam('sAmazonSellerId') !== ''
            );
        }

        return $this->_isActive;
    }