try {
  const { data } = await clinik.patients.create({ firstName: '', lastName: '' });
} catch (err) {
  if (err.name === 'ClinikValidationError') {
    // 422 — request body failed validation
    console.error('Issues:', err.issues);
  } else if (err.name === 'ClinikRateLimitError') {
    // 429 — rate limit exceeded
    console.error('Retry after:', err.retryAfter, 'seconds');
  } else if (err.name === 'ClinikNotFoundError') {
    // 404 — resource not found
    console.error('Not found:', err.message);
  } else if (err.name === 'ClinikApiError') {
    // Any other API error
    console.error('Code:', err.code);
    console.error('Status:', err.status);
    console.error('Request ID:', err.requestId);
  }
}

Attempt 1: random(0, 2000ms)
Attempt 2: random(0, 4000ms)
Attempt 3: random(0, 8000ms)
Cap: 10,000ms

const clinik = new Clinik(key, {
  retries: 3,      // default: 2
  timeout: 15000,  // default: 30000ms
});

{
  "issues": [
    {
      "severity": "error",
      "code": "invalid",
      "diagnostics": "firstName: String must contain at least 1 character(s)"
    }
  ]
}