I'm testing the Photo_Shop plugin with Coppermine and Joomla integration - although the order is made and can proceed to checkout - when the "confirm your order" button is hit nothing happens. This does however work when not integrated with Joomla but I wish to get it working with the integration. There are some CSS issues as well.
http://blog.halinasplace.com.au/coppermine
We can't support Joomla, as we're not familiar with it. If things work without Joomla integration, but doesn't work with Joomla, then you can hardly expect help from us. The Joomla wrapper is not provided by us and we're not fond of it.