How to use core_course_get_courses?

Hi, I am testing web services using a moodle core web service, core_course_get_courses. I think this web service returns all courses from Moodle, but I only get data from a course when I fix a ID course.

I am using the next code, in REST,

options[ids][0]=""

but I get the next error message,

Invalid external api parameter: the server was expecting int type

When I fix a id course, for example,

options[ids][0]="4"

I get the data from course 4, but I dont' know how to use this web service to get all courses list.

Please, can somebody to help me?

Thanks in advance.