Check if student submitted assignment via Moodle web services

I am trying to use the Moodle API (web services) to get information about (my) assignment submissions. I want to know whether I submitted an attempt for the assignment already or not. I am using the `mod_assign_get_assignments` function (which doesn't have too much documentation) and the results I get (when looking at the `assignments` portion of each course) are: ``` { "id": 25960, "cmid": 350053, "course": 8013502, "name": "\u05d4\u05d2\u05e9\u05ea \u05ea\u05e8\u05d2\u05d9\u05dc \u05d1\u05d9\u05ea 1", "nosubmissions": 0, "submissiondrafts": 0, "sendnotifications": 0, "sendlatenotifications": 0, "sendstudentnotifications": 0, "duedate": 1617566400, "allowsubmissionsfromdate": 0, "grade": 100, "timemodified": 1615897679, "completionsubmit": 1, "cutoffdate": 1617569940, "gradingduedate": 0, "teamsubmission": 0, "requireallteammemberssubmit": 0, "teamsubmissiongroupingid": 0, "blindmarking": 0, "hidegrader": 0, "revealidentities": 0, "attemptreopenmethod": "manual", "maxattempts": 1, "markingworkflow": 0, "markingallocation": 0, "requiresubmissionstatement": 0, "preventsubmissionnotingroup": 0 ...irrelevant configuations } ``` The above result is for an assignment I have already submitted. An example of an assignment I did not submit is: ``` { "id": 19764, "cmid": 268225, "course": 8013201, "name": "\u05ea\u05d9\u05d1\u05ea \u05d4\u05d2\u05e9\u05d4 14", "nosubmissions": 0, "submissiondrafts": 0, "sendnotifications": 0, "sendlatenotifications": 0, "sendstudentnotifications": 0, "duedate": 1611693000, "allowsubmissionsfromdate": 0, "grade": 100, "timemodified": 1610972842, "completionsubmit": 0, "cutoffdate": 1611694860, "gradingduedate": 0, "teamsubmission": 0, "requireallteammemberssubmit": 0, "teamsubmissiongroupingid": 0, "blindmarking": 0, "hidegrader": 0, "revealidentities": 0, "attemptreopenmethod": "manual", "maxattempts": 1, "markingworkflow": 0, "markingallocation": 0, "requiresubmissionstatement": 0, "preventsubmissionnotingroup": 0 ...irrelevant configuations } ``` The only apparent difference between these (that might point to a way to check if I submitted it or not) is the `completionsubmit` property, but that cannot be the solution because a different assig...