Cafe Solo, this might just be part of Amazon's security process. Do you have an Amazon account and password? If so, they sometimes require you to enter a code that has been sent to your email, mobile, etc, as part of the log in process to be entered on their site. Once logged in you can then order your book. A lot of online accounts are requiring a similar authentication procedure these days. Tiresome, but it is to protect your account. I can't think why else they would send you a code. Hope that helps.