AbleCommerce Shopping Cart Software

I have had 2 clients now try to use the "Issue refund" option after they have captured the payment with Authorize.net. It asks for the last 4 digits of the card in order to process the refund, but i each case, the transaction fails. Is this a bug? Are we doing this correctly?

I am looking for a programmer(s) to assists with some overflow work for skinning AbleCommerce sites.You would be provided with Photoshop PSD files for conversion into Able themes. Some custom programming (like rearranging the components of a standard page layout) may apply. Please send your qualific...

I have created several subcategories which I no longer need. How do I delete them using the admin tool? Deleting the main category is not a suitable option, and I am not experienced enough in the code to do it from there.
Thanks!