Addon adds the ability to inform the client that he met the proposed price lower you, and inform using the form to the client was able to buy this product from you if you agree to reduce its proposed level.
All information provided to the customer address information is sent to the store administrator.
In a message sent to a product name, customer name, e-mail client, data on the link where it is cheaper, or contact the store where you can look cheaper.
Use "Add or Update" of JoomShopping, and insctall as addon of JoomShopping. (/administrator/index.php?option=com_jshopping&controller=update)