Online course registration Registrationprocess User User Course wanted Search for course Choose course Register to course Registration denied Pay Repeat payment? end Payment confirmation Registration done Courseregistrationsystem Course registration system Evaluate User Registration Is registration ok? Cancel registration Is verified? Store user to DB Users database Verify payment Bank This is a process that shows user registration flow to the online course. User has to choose his course, register and pay. Šimon Mačejovský, 444140 PV207/01CZECH noyes Registration accepted Verificationrequest Verificationresponse no yes yes no -1 unnecessary terminate -1 this parallelism is not needed -1 This gateway does not have data from user Result: 5