curl --request POST \
  --url https://sandbox.withclasp.com/subclasses \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "employer": "<string>",
  "is_default": true
}
'

{
  "id": "<string>",
  "name": "<string>",
  "employer": "<string>",
  "is_default": true
}