curl -X PATCH 'https://api.example.com/subjects/sub_123' \
  -H 'Authorization: Bearer YOUR_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{
    "metadata": {
      "name": "John Doe Updated",
      "email": "john.updated@example.com"
    }
  }'

const axios = require('axios');

const { data } = await axios.patch('https://api.example.com/subjects/sub_123', {
  metadata: { name: 'John Doe Updated', email: 'john.updated@example.com' },
}, {
  headers: { 'Authorization': 'Bearer YOUR_TOKEN' },
});

{
  "id": "sub_123",
  "type": "user",
  "externalId": "user-456",
  "metadata": {
    "name": "John Doe Updated",
    "email": "john.updated@example.com"
  }
}