{
  "success": false,
  "error": "Human-readable error message",
  "code": "ERROR_CODE"
}

const makeRequest = async (url, options) => {
  const response = await fetch(url, options);
  const data = await response.json();
  
  if (!data.success) {
    switch (data.code) {
      case 'NO_ACTIVE_SUBSCRIPTION':
        // Handle subscription issue
        showSubscriptionModal();
        break;
      case 'LIMIT_EXCEEDED':
        // Handle limit exceeded
        showUpgradePrompt();
        break;
      case 'DUPLICATE_SUBJECT_REFERENCE':
        // Use existing verification
        return handleDuplicate(data.data.existingVerificationId);
      default:
        throw new Error(data.error);
    }
  }
  
  return data;
};