Create a CourseWork assignment in Google Classroom and retrieve its student submissions

Steps

1. Call POST https://classroom.googleapis.com/v1/courses/{courseId}/courseWork (courses.courseWork.create) with a CourseWork body; title and workType (e.g. "ASSIGNMENT") are required, everything else optional; requires scope classroom.coursework.students.
2. Explicitly set state to "PUBLISHED" if you want it visible right away, since an unspecified state creates the CourseWork in draft state.
3. Call GET https://classroom.googleapis.com/v1/courses/{courseId}/courseWork/{courseWorkId}/studentSubmissions (courses.courseWork.studentSubmissions.list) to fetch submissions; pass "-" as courseWorkId to pull submissions across every course work item in the course.
4. Narrow results with query params userId (numeric id, email, or "me"), states[] (SubmissionState), and late (LATE_ONLY/NOT_LATE_ONLY).
5. Use scope classroom.coursework.students(.readonly) as a teacher/admin, or classroom.coursework.me(.readonly) as the student themself.