Get the Percentage over all attendance sessions on a given user course?

I am developing an application that integrates several services from my university, one of them is moodle, for that I am using the moodle API service.

I am trying to use the following request

https://moodle.ufsc.br/webservice/rest/server.php?wstoken=my_attendance_token&moodlewsrestformat=json&userid=148540&wsfunction=mod_wsattendance_get_courses_with_today_sessions

But I get an empty list.

I don't want to change the values. What I want is to count the student's presence in each course and make the attendance percentage. How can I get this information?