Adding activities to a course with web service

I was able to create a new course with 

http://***domain***/webservice/rest/server.php?wstoken=********************&wsfunction=core_course_create_courses&moodlewsrestformat=json&courses[0][categoryid]=5&courses[0][fullname]=testcoursename&courses[0][shortname]=testcoursename

Now I want to add activities to the course using web service. Is this possible? Is there already a function that could be called?