tCategory;
        woocommerce_wp_select(
            [
                'id' => 'voucher[' . $variation->ID . ']',
                'label' => __('Mollie Voucher category', 'mollie-payments-for-woocommerce'),
                'value' => get_post_meta($variation->ID, 'voucher', true),
                'options' => [
                    $defaultCategory => __('Same as default category', 'mollie-payments-for-woocommerce'),
                    Voucher::NO_CATEGORY => __('No Category', 'mollie-payments-for-woocommerce'),
                    Voucher::MEAL => __('Meal', 'mollie-payments-for-woocommerce'),
                    Voucher::ECO => __('Eco', 'mollie-payments-for-woocommerce'),
                    Voucher::GIFT => __('Gift', 'mollie-payments-for-woocommerce'),
                ],
            ]
        );
    }

    /**
     * Save the voucher option in the variation product
     * @param $variation_id
     * @param $i
     */
    public function saveVoucherFieldVariations($variation_id, $i)
    {
        $optionName = 'voucher';
        //phpcs:ignore WordPress.Security.NonceVerification.Missing
        $voucherCategory = isset($_POST[$optionName]) && isset($_POST[$optionName][$variation_id])
        //phpcs:ignore WordPress.Security.NonceVerification.Missing
                ? sanitize_text_field(wp_unslash($_POST[$optionName][$variation_id]))
                : false;

        if ($voucherCategory) {
            update_post_meta($variation_id, $optionName, esc_attr($voucherCategory));
        }
    }

    public function addVoucherVariationData($variations)
    {
        $optionName = 'voucher';
        $variations[$optionName] = get_post_meta($variations[ 'variation_id' ], $optionName, true);
        return $variations;
    }
}