I bought this pdf book yesterday. The paypal UI described in this book was different from the real UI I saw at http://developer.paypal.com. This made some confusion to me. My experience of learning paypal api from this book ended up to be uncomfortable. I owned 2 other Progmatic Programmers published books and those books were great.
I’ve given up reading this book. I strongly suggest the author of this pdf book give a update on it.
Yi Zhang 12/23/2008