const res = await fetch('https://api.sandstone.com/v1/issues', {
  headers: {
    'Authorization': `Bearer ${apiKey}`,
    'X-Workspace-Id': workspaceId,
  },
});

if (!res.ok) {
  const { error } = await res.json();
  switch (error.code) {
    case 'UNAUTHENTICATED':
      // Refresh token or re-authenticate
      break;
    case 'RATE_LIMITED':
      // Back off and retry
      break;
    case 'NOT_FOUND':
      // Resource doesn't exist
      break;
    default:
      console.error(`API error: ${error.message}`);
  }
}