I don't know much about Magento so I need some advice. I do know PHP.
A client wants to update their website to ecommerce and use Magento as the framework but they want to use their current accounting package for user logins, products, orders account, etc because the data is already there.
So, what is the best way to tackle it in Magento? Should I be looking at doing an entirely new custom module or overriding the existing code for database queries? Like I said, I don't know much about Magento or its internals so I'm not even sure the second option is feasible...
Any advice from people that have done this (or are just familiar with Magento)?