different amount per product

functions.php

<?php

add_filter('gens_raf_coupon_amount', 'modify_raf_coupon_amount', 10, 2);

function modify_raf_coupon_amount($amount, $order_id) {
    // Get the order object
    $order = wc_get_order($order_id);

    if (!$order) {
        return $amount; // Return default amount if order not found
    }

    // Define the product ID you want to check for
    $target_product_id = 123; // Replace with your actual product ID

    // Flag to check if the target product is in the order
    $target_product_found = false;

    // Loop through order items
    foreach ($order->get_items() as $item) {
        $product_id = $item->get_product_id();

        if ($product_id == $target_product_id) {
            $target_product_found = true;
            break;
        }
    }

    // Modify the coupon amount if the target product is found
    if ($target_product_found) {
        // Set your custom amount here
        $new_amount = 20; // For example, set to 20

        return $new_amount;
    }

    // Return the default amount if the target product is not in the order
    return $amount;
}