I have three suggestions:
1. We don't need to ever see the customer's credit card number, not even me. The last 4 or 5 digits is enough. By showing the credit card number I have to have stronger protections and policies to be PCI compliant. Please add a button that allows me to choose what I want>
2. Sale Tax issue. In talking to the CA BOE, I am to charge the CA sales tax based upon where in CA the order was placed. Different counties/cities in CA have different rates. You have a flat CA sales tax rate of 8.75% which is to high. I am over charging my customers in sales tax. I believe this might be illegal.
3. Setting up shipping/handling is still very confusing and difficult with so many different options and place to enter values (shipping set up and product shipping tab). I think you need more training videos on shipping setup, what different option offer, foreign shipping, etc. For example we have a free book which we only charge handling, no shipping. It took your own tech support person a few tries on how to make this happen and where to do it.
Hope this helpd