We currently use X-Cart, a PHP/MySQL based shopping cart for our online sales. I need our old order and user data from two previous cart systems migrated over. Both the old systems are PHP/MySQL-based as well. One is CubeCart, and the other is SkooksKart. We don't need any product data - just the barebones users and orders.
As a minor, added complication, we'll need just a subset of the users from one of those systems - only those customers who have purchased a specific product. But making things MUCH easier is the fact that we only sell three products, and none of them are taxable, nor shipped (which means many of the fields in the current cart can be populated with dummy values, instead of actually carrying over the fields from the other cart).
One of my major concerns with this project is protecting the privacy of our customers, and as such, I'm reluctant to give anyone access to the full, live databases. I'd appreciate any solutions for dealing with this, and if it's possible to work on the project from a small export of the current database, then that's a big plus.