I am using magento with another php site.when a user register or login in magento user will register or login in php site also and vice versa.
but when user checkout as a guest and check the box "create an account for later use" it will create an account in magento only.I want to register the same user in php site also.
I am using onepage checkout method.Can anybody tell me which file or function i have to edit for this?