class Payment_Gateway_Discounts { funkcja publiczna __construct() { // Zarejestruj ustawienia add_action(’admin_init’, array($this, 'register_payment_gateway_discount_settings’));

    // Add the settings page
    add_action('admin_menu', array($this, 'add_payment_gateway_discount_settings_page'));

    // Display the settings page
    add_action('admin_menu', array($this, 'payment_gateway_discount_settings_page'));

    // Display discount in gateway title
    add_filter('woocommerce_gateway_title', array($this, 'add_discount_amount_to_gateway_title'), 10, 2);

    // Apply discount based on payment gateway
    add_action('woocommerce_cart_calculate_fees', array($this, 'apply_discount_based_on_payment_gateway'), 10, 1);

    // Refresh payment method
    add_action('woocommerce_review_order_before_payment', array($this, 'ts_refresh_payment_method'));
}

public function register_payment_gateway_discount_settings() {
    register_setting('payment_gateway_discount', 'payment_gateway_discounts');
}

public function add_payment_gateway_discount_settings_page() {
    add_options_page(
        'Payment Gateway Discount',
        'Payment Gateway Discount',
        'manage_options',
        'payment_gateway_discount',
        array($this, 'payment_gateway_discount_settings_page')
    );
}

public function payment_gateway_discount_settings_page() {
    $gateways = WC()->payment_gateways->payment_gateways();
    ?>
    <div class="wrap">
        <h1>Payment Gateway Discount</h1>
        <form method="post" action="options.php">
            <?php settings_fields('payment_gateway_discount'); ?>
            <table class="form-table">
                <tbody>
                    <?php foreach ($gateways as $gateway) : ?>
                        <tr>
                            <th scope="row"><?php echo $gateway->title; ?></th>
                            <td>
                                <input type="number" name="payment_gateway_discounts[<?php echo $gateway->id; ?>]" value="<?php echo get_option('payment_gateway_discounts')[$gateway->id] ?? ''; ?>" min="0" max="100">%
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
            <?php submit_button(); ?>
        </form>
    </div>
    <?php
}

public function add_discount_amount_to_gateway_title($title, $gateway_id) {
    $discounts = get_option('payment_gateway_discounts');

    if (isset($discounts[$gateway_id]) && $discounts[$gateway_id] > 0) {
        $discount_amount = $discounts[$gateway_id];
        $title .= " <span style="color: green;">(-$discount_amount% off)</span>";
    }

    return $title;
}

public function apply_discount_based_on_payment_gateway($cart) {
    if (is_admin() && !defined('DOING_AJAX')) {
        return;
    }

    $discounts = get_option('payment_gateway_discounts');
    $chosen_gateway = WC()->session->get('chosen_payment_method');

    if (isset($discounts[$chosen_gateway])) {
        $discount_amount = $discounts[$chosen_gateway];
        $discount = $cart->subtotal * ($discount_amount / 100);
        $cart->add_fee("Discount for $chosen_gateway", -$discount);
    }
}

public function ts_refresh_payment_method() {
    ?>
    <script type="text/javascript">
        (function($){
            $('form.checkout').on('change', 'input[name^="payment_method"]', function() {
                $('body').trigger('update_checkout');
            });
        })(jQuery);
    </script>
    <?php
}

}

nowa Payment_Gateway_Discounts();