Did you know that the Solo payment card will soon be de-activated. From 31st March 2011, card issuers will stop accepting Solo transactions.
Customers who have been using a Solo will have been informed about the change, but if you charge a Solo card on a repeat transaction basis, you will need to update the customer's information.
Depending on your payment service provider, you shouldn't need to do anything, but it may be worthwhile checking that if people try to use a Solo card after the 31st, their transaction won't fail. The last you want as an ecommerce site owner is customers to think your site is broken or inefficient, when in fact their transaction was declined because their card was out of service.
Perhaps a banner or message to remind people of the change will help