curl -X POST https://api.chessplay.io/api/v1/batches/1/add-student/ \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"student_id": 123}'

import requests

headers = {"Authorization": "Bearer YOUR_ACCESS_TOKEN"}
response = requests.post(
    "https://api.chessplay.io/api/v1/batches/1/add-student/",
    headers=headers,
    json={"student_id": 123}
)

{
  "message": "Student added successfully",
  "student": {
    "id": 123,
    "username": "FastMalamute",
    "name": "John Doe"
  }
}

{
  "error": "Student is already in this batch"
}