private function addCentinelData($options)
    {
        $this->required_options('cavv, eci_flag, xid, enrolled, pares_status, signature_verification', $options);

        $this->post['ProcessTransaction']['TransactionRequest']['Body']['TransactionInfo']['AuthInfo']['Cavv'] = $options['cavv'];
        $this->post['ProcessTransaction']['TransactionRequest']['Body']['TransactionInfo']['AuthInfo']['Eci'] = $options['eci_flag'];
        $this->post['ProcessTransaction']['TransactionRequest']['Body']['TransactionInfo']['AuthInfo']['Xid'] = $options['xid'];
        $this->post['ProcessTransaction']['TransactionRequest']['Body']['TransactionInfo']['AuthInfo']['Enrolled'] = $this->ENROLLED_MAPPINGS[$options['enrolled']];
        $this->post['ProcessTransaction']['TransactionRequest']['Body']['TransactionInfo']['AuthInfo']['PAResStatus'] = $this->PARES_MAPPINGS[$options['pares_status']];
        $this->post['ProcessTransaction']['TransactionRequest']['Body']['TransactionInfo']['AuthInfo']['SignatureVerification'] = $this->SIGNATURE_MAPPINGS[$options['signature_verification']];
    }