Code-Snippets-Functions/Execute a function on a child site/WooCommerce/display-a-checkbox-only-for-specific-product-on-cart-page.txt

add_action('woocommerce_proceed_to_checkout', 'cart_disclaimer1_test', 10);
function cart_disclaimer1_test() {
    // Here, define the targeted product ID
    $targeted_product_id = 121;

    // Check if the targeted product is in cart
    if ( in_array( $targeted_product_id, array_column( WC()->cart->get_cart(), 'product_id' ) ) ) {
        echo '<input type="checkbox" name="disclaimer1" required />';
        echo '<p>This is a test</p>';
    }
}