you can use your own database with eCart, or use the one we provide as a starting point.
also, you can edit the column names in the database we provide if you like.
If you want to do this, i would suggest doing it before you use eCart, not after. If you do this after using eCart, it will break the code because it will be referencing the old column names not the new ones.
When running the checkout wizard, the Section for store order information allows you to use one of the presets, or if you prefer, to use you own table.
If you select to use your own table, you will need to bind the columns of your table to the columns of eCart.