Generate exam-style questions

curl -X POST "https://www.revisiongenie.com/api/v1/questions/generate" \
  -H "Authorization: Bearer rgk_live_YOUR_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{"topic":"Photosynthesis","types":["written","multipleChoice"],"count":2,"subject":"Biology","qualification":"GCSE","examBoard":"AQA"}'

// anchored on a topic, both shapes
{
  "source": "topic",
  "subtopic": null,
  "topic": "Photosynthesis",
  "subject": {
    "id": "6612f0a1c3b4d5e6f7a80912",
    "name": "Biology",
    "qualification": "GCSE",
    "examBoard": "AQA"
  },
  "questions": [
    {
      "type": "written",
      "question": "Explain why the rate of photosynthesis stops rising once light intensity is very high.",
      "marks": 3,
      "markScheme": "Light is no longer the limiting factor (1 mark)\nAnother factor limits the rate (1 mark)\nAccept: carbon dioxide concentration or temperature (1 mark)",
      "markSchemePoints": [
        "Light is no longer the limiting factor (1 mark)",
        "Another factor limits the rate (1 mark)",
        "Accept: carbon dioxide concentration or temperature (1 mark)"
      ]
    },
    {
      "type": "multipleChoice",
      "question": "Which gas is taken in by a leaf during photosynthesis?",
      "options": ["Oxygen", "Carbon dioxide", "Nitrogen", "Hydrogen"],
      "correctAnswer": "Carbon dioxide",
      "explanation": "Carbon dioxide diffuses in through the stomata and is combined with water to make glucose."
    }
  ],
  "usage": { "costPence": 8, "balancePence": 4808 }
}

// anchored on a subtopic, written only (what you get with no "types")
{
  "source": "subtopic",
  "subtopic": {
    "id": "6612f0e5c3b4d5e6f7a80d01",
    "name": "Eukaryotes and prokaryotes",
    "topic": "Paper 1: Cell biology and organisation",
    "subject": "Biology",
    "hierarchy": "exam"
  },
  "topic": null,
  "subject": {
    "id": "6612f0a1c3b4d5e6f7a80912",
    "name": "Biology",
    "qualification": "GCSE",
    "examBoard": "AQA"
  },
  "questions": [
    {
      "type": "written",
      "id": "6613a1b2c3d4e5f6a7b80101",
      "question": "(a) Name two structures found in a plant cell but not in an animal cell. [2]\n(b) Explain why a bacterial cell is described as prokaryotic. [3]",
      "marks": 5,
      "markScheme": "(a) Cell wall (1); chloroplast / permanent vacuole (1) ...",
      "markSchemePoints": ["(a) Cell wall (1); chloroplast / permanent vacuole (1) ..."],
      "parts": [
        {
          "partNumber": "a",
          "question": "Name two structures found in a plant cell but not in an animal cell.",
          "marks": 2,
          "answerFormat": "lined"
        }
      ]
    }
  ],
  "usage": { "costPence": 8, "balancePence": 4800 }
}