I used OpenERP 8 - Install POS Module with Multiply Company
I need to add Button (Link to other website) In POS.Customer Screen
And I will send Get String too.
CardID=<Customer.Name>
TranID=<pos.order>
Total=<pos.order.totalAmount>
Send Like This : www.xxx.com/MemberShip/Check.php?CardID=<Customer.Name>&TranID=<pos.order>&Total=<pos.order.totalAmount>
Capture Image : http://i57.tinypic.com/2uz9pqr.jpg