add_filter('hf_alter_coupon_csv_header', 'hf_csv_coupon_add_more_columns', 10, 1);
function hf_csv_coupon_add_more_columns($csv_columns) {

    $csv_columns['meta:_wc_url_coupons_unique_url'] = 'meta:_wc_url_coupons_unique_url';
    $csv_columns['meta:_wc_url_coupons_redirect_page'] = 'meta:_wc_url_coupons_redirect_page';
    $csv_columns['meta:_wc_url_coupons_redirect_page_type'] = 'meta:_wc_url_coupons_redirect_page_type';
    $csv_columns['meta:_wc_url_coupons_product_ids'] = 'meta:_wc_url_coupons_product_ids';
    $csv_columns['meta:_wc_url_coupons_defer_apply'] = 'meta:_wc_url_coupons_defer_apply';

    return $csv_columns;
}

add_filter('hf_alter_coupon_csv_data', 'hf_csv_coupon_add_more_data', 10, 1);
function hf_csv_coupon_add_more_data($coupon_data) {

    $coupon_id = $coupon_data[1];
    $coupon_data['meta:_wc_url_coupons_unique_url'] = get_post_meta( $coupon_id, '_wc_url_coupons_unique_url' , TRUE);
    $coupon_data['meta:_wc_url_coupons_redirect_page'] = get_post_meta( $coupon_id, '_wc_url_coupons_redirect_page' , TRUE);
    $coupon_data['meta:_wc_url_coupons_redirect_page_type'] = get_post_meta( $coupon_id, '_wc_url_coupons_redirect_page_type' , TRUE);
    $product_ids = get_post_meta( $coupon_id, '_wc_url_coupons_product_ids' , TRUE);
    $coupon_data['meta:_wc_url_coupons_product_ids'] = (!empty(($product_ids))) ? implode(',', $product_ids): '';
    $coupon_data['meta:_wc_url_coupons_defer_apply'] = get_post_meta( $coupon_id, '_wc_url_coupons_defer_apply' , TRUE);

    return $coupon_data;
}