Allow specific products to be purchased only if a coupon is applied in Woocommerce

I am working on a woocommerce website and I am trying to restrict a product to be purchased only if a coupon is applied for it, so it should not be processed without adding a coupon code. User must enter a coupon code to be able to order this specific product (not on all other products).

Any help is appreciated.

Answer

For defined products, the following code will not allow checkout if a coupon is not applied, displaying an error message:

add_action( 'woocommerce_check_cart_items', 'mandatory_coupon_for_specific_items' );
function mandatory_coupon_for_specific_items() {
    $targeted_ids   = array(37); // The targeted product ids (in this array)
    $coupon_code    = 'summer2'; // The required coupon code

    $coupon_applied = in_array( strtolower($coupon_code), WC()->cart->get_applied_coupons() );

    // Loop through cart items
    foreach(WC()->cart->get_cart() as $cart_item ) {
        // Check cart item for defined product Ids and applied coupon
        if( in_array( $cart_item['product_id'], $targeted_ids ) && ! $coupon_applied ) {
            wc_clear_notices(); // Clear all other notices

            // Avoid checkout displaying an error notice
            wc_add_notice( sprintf( 'The product"%s" requires a coupon for checkout.', $cart_item['data']->get_name() ), 'error' );
            break; // stop the loop
        }
    }
}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

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And in checkout:

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