The book "Payment Technologies for E-Commerce" offers a comprehensive analysis of electronic payment methods, which are considered the economic backbone of e-commerce. It addresses key topics such as public key infrastructure, smart cards, payment agents, digital currencies, SET protocols, and micropayments. The first half of the book focuses on the infrastructure for secure electronic payments on the internet, while the second half details various payment methods and systems. This specialized book is aimed at e-business developers, master's level students, and consultants, making it an excellent resource for use in courses and training sessions in the field of e-commerce or electronic payments.