I currently have a solution for adding multiple items to a cart, with varying quantities and prices, using the following code (see below), and would like to add an option for a personalised message, which shows up as part of the PayPal order, perhaps as a separate (non-chargeable?) item.
I've tried the on0 and os0 variables, etc., but to no avail. Any ideas? I would like, if at all possible, to keep all the order details in PayPal (rather than complicate things by separately storing the personalised message product option on the client website).