public function process_cmb_form($fields)
{
$cmb = $this->get_cmb_object();
if (isset($fields['object_id'], $fields[$cmb->nonce()]) && wp_verify_nonce($fields[$cmb->nonce()], $cmb->nonce()) && $fields['object_id'] == $this->button_slug) {
wp_send_json_success($this->sanitize_cmb_fields($fields));
}
wp_send_json_error(__('failed verification'));
}