I would have preferred that
I would have preferred that you did not offer Amazon Pay as a way to pay for the book. Amazon Pay does not take a discount code, does not break down the total cost of the item (i.e. tax, shipping) and does not give you a chance to check your order to find these things out until it is too late to back out. If you make an honest mistake, as I did, Amazon Pay does not accept any responsibility or any recourse other than to direct you to the publisher.