check_answer

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "answer": {
      "type": "string",
      "description": "The user's answer to grade, if they have one"
    },
    "language": {
      "enum": [
        "en",
        "fr"
      ],
      "type": "string",
      "description": "Language the answer (and question_text, if given) is written in; grading compares against that language's text"
    },
    "question_id": {
      "type": "string",
      "description": "The question id, e.g. q-042 (exact match)"
    },
    "question_text": {
      "type": "string",
      "description": "The question as the user remembers it (fuzzy matched); used when no id is given"
    }
  }
}