Please note that all payments made via this site are final and will not be reversed.  If you are unhappy with the book you have purchased, you may express your dissatisfaction via a review of the book, and your criticism will be acknowledged and taken as a lesson.  If you have problems with accessing the book you have purchased and do not wish to exchange your access for another book available on the site, you will be given credit to purchase another book in the future, if you decide to keep your account open.  If you close your account without obtaining the ebook you purchased, you are free and welcome to re-open or create a new account at anytime in the future.