wc_add_notice working randomly in WooCommerce add to cart validation

Question

So I'm making some custom code to Allow specific producut purchase based on points accumulated from WooCommerce's points and rewards plugin, when checking the points balance, I'm using wc_add_notice to display the error if their balance is not enough. It worked the first time, then I can no longer get those notices, I tried executing it in multiple different ways, nothing seems to work !

Here's my code :

function enforce_points_based_registration( $valid, $product_id ) {

    if ( $product_id == 4465 ) {
        $points_required = get_post_meta( $product_id, 'points_required', true); 
        $user_id = get_current_user_id();
        $user_points = WC_Points_Rewards_Manager::get_users_points( $user_id );
        $current_user= wp_get_current_user();
        $user_email = $current_user->email;

        if ( wc_customer_bought_product( $user_email, $user_id, $product_id )) {
            $message = "You have already bought the Vendor package";
            wc_add_notice( apply_filters('wc_add_to_cart_message', $message, $product_id), "error");
            return false;
        }
        
        if ( dokan_is_user_vendor( $user_id) ) {
            $message = "You are already a vendor.";
            wc_add_notice( apply_filters('wc_add_to_cart_message', $message, $product_id), "error");
            return false;
        }
        
        if ( $user_points < $points_required ) {

            // User doesn't have enough points, prevent purchase
            $message = "You don't have enough points to purchase the subscription";
            wc_add_notice( apply_filters( 'wc_add_to_cart_message', $message, $product_id ),  "error" );

            return false;
        } else {

            // User has enough points, place the order
            $product = wc_get_product( $product_id );
            $order = wc_create_order();
            $order->add_product( $product, 1 );
            $order->set_customer_id( $user_id );
            $order->calculate_totals();
            $order->update_status( 'completed' );

            // Deduct points
            WC_Points_Rewards_Manager::decrease_points( $user_id, $points_required, 'vendor_registration', $order->get_id() );

 
            // Add custom message to the order notes
            $order->add_order_note( apply_filters( 'wc_add_to_cart_message', "The order was automatically placed and paid for using points.", $product_id ) );
            
        }
    }
    return $valid;
}
add_filter( 'woocommerce_add_to_cart_validation', 'enforce_points_based_registration', 10, 2 );

I tried calling it that way with apply_filters, which worked the first time, I also tried wc_add_notice($message,$type) still nothing seems to work, although most of the code works as expected.

The code is placed in functions.php ( Child theme )

Answer 1

The filter hook wc_add_to_cart_message doesn't exist in WooCommerce, so you should remove it from all wc_add_notice() functions in your code, as it can be the source of your issue, and doesn't provide anything useful.

I have revised your code, try the following:

function enforce_points_based_registration( $passed, $product_id ) {
    global $current_user;

    if ( $product_id != 4465 ) 
        return $passed;

    $points_required = get_post_meta( $product_id, 'points_required', true); 
    $user_points     = WC_Points_Rewards_Manager::get_users_points( $current_user->ID );

    if ( wc_customer_bought_product( $current_user->email, $current_user->ID, $product_id )) {
        wc_add_notice( __("You have already bought the Vendor package", "woocommerce"), "error");
        $passed = false;
    } 
    elseif ( dokan_is_user_vendor( $current_user->ID) ) {
        wc_add_notice( __("You are already a vendor", "woocommerce"), "error");
        $passed = false;
    } 
    elseif ( $user_points < $points_required ) {
        // User doesn't have enough points, prevent purchase
        wc_add_notice( __("You don't have enough points to purchase the subscription", "woocommerce"),  "error" );
        $passed = false;
    } 
    else {
        // User has enough points, place the order
        $order = wc_create_order();
        $order->add_product( wc_get_product( $product_id ), 1 );
        $order->set_customer_id($current_user->ID);
        $order->calculate_totals();
        $order->update_status( 'completed' );

        // Deduct points
        WC_Points_Rewards_Manager::decrease_points( $current_user->ID, $points_required, 'vendor_registration', $order->get_id() );
 
        // Add custom message to the order notes
        $order->add_order_note( __("The order was automatically placed and paid with user's points.", "woocommerce") );
    }
    return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'enforce_points_based_registration', 10, 2 );

It may work now.