The goal of the thesis is to analyze chosen electronic payment systems. The thesis is divided into two parts -- theoretical and practical. Theoretical part is dedicated to cover types of electronic payment system. Also is devoted to the issues of certain legal aspects that are common to all payment systems; defines the necessary concepts and business entities commonly encountered in the payment processing environment. Practical part focuses on the evaluation of usability, safety and usefulness for merchants mainly working with credit cards and particularly with alternative payment system like PayPal, iDEAL, Sofortbanking and Webmoney. Consider the advantages and disadvantages of certain payment systems. Describes the practical applicability...