curl -X GET 'https://api.example.com/subjects/sub_123' \
  -H 'Authorization: Bearer YOUR_TOKEN'

const axios = require('axios');

const { data } = await axios.get('https://api.example.com/subjects/sub_123', {
  headers: { 'Authorization': 'Bearer YOUR_TOKEN' },
});

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