The authors and contributors wish to thank Rael Dornfest, Kyle Hart, and Dan Woods. Jamie Peppard, Brian Sawyer and Darren Kelly were instrumental in cleaning up our work for this book.

Shannon Sofield

I'd like to thank the PayPal team for creating a great service and for their support throughout this process. I also would like to thank the "Daves" that helped get this book written: Dave McClure, for being there from the beginning, David A. Karp for putting up with my writing habits, Dave Nielsen for his expertise and management, and Dave Burchell for stepping up and helping us get this out the door. Also, thanks to my parents and friends for their motivation.

Dave Nielsen

I'd like to thank PayPalians, past and present, for creating this awesome payment platform; Dave McClure, my PDN mentor, for taking me under his wing; PB, for his mastery of the multitude of PayPal's intricate features; David A. Karp, cat-wrangler extraordinaire, for his encouragement and perseverance; Mom and brother Mark for putting up with my quest for answers to life's persistent questions; Dad for leaving me his wacky inventiveness; and Erika, my inspiration, who makes me smile every day. Erika, I feel so lucky to have found you. With you, every day is beautiful and new. Nothing would make me happier than to spend the rest of my life with you...Erika Anderson, will you marry me?

Dave Burchell

I wish to extend my thanks to the many coworkers who assisted me while working on this book, including Paulam Chang, Debbie Becker, Claudia Erickson, Stephen Ivaskevicius, Warren Lynch, Patrick O'Neal, Michelle Taylor, Patricia Truit, and Kim Weiss. My thanks also to marketing maven Evelyn Schlaphoff of SourceLink/Los Angeles, guru Mike Lewis of The World Book, and to our masterful, patient, and dedicated editor, David A. Karp.