protected function settlementModuleFields($acting_opts) {
        ?>
        <tr>
            <th>
                <a class="explanation-label" id="label_ex_channel_id_linepay">
                    <?php echo esc_html__('Channel ID', 'wcex_linepay'); ?>
                </a>
            </th>
            <td colspan="6">
                <input
                    name="channel_id"
                    type="text"
                    id="channel_id_linepay"
                    value="<?php echo esc_attr($acting_opts['channel_id']); ?>"
                    size="20"
                />
            </td>
        </tr>
        <tr id="ex_channel_id_linepay" class="explanation">
            <td colspan="2">
                <?php echo esc_html__('The Channel ID issued by LINE.', 'wcex_linepay'); ?>
            </td>
        </tr>
        <tr>
            <th>
                <a class="explanation-label" id="label_ex_channel_secret_key_linepay">
                    <?php echo esc_html__('Channel Secret Key', 'wcex_linepay'); ?>
                </a>
            </th>
            <td colspan="6">
                <input
                    name="channel_secret_key"
                    type="text"
                    id="channel_secret_key_linepay"
                    value="<?php echo esc_attr($acting_opts['channel_secret_key']); ?>"
                    size="20"
                />
            </td>
        </tr>
        <tr id="ex_channel_secret_key_linepay" class="explanation">
            <td colspan="2">
                <?php echo esc_html__('Channel Secret Key issued by LINE.', 'wcex_linepay'); ?>
            </td>
        </tr>
        <?php
    }