Secure Sync & Authentication

Seamless Identity with Google OAuth

Credit Card Co-Pilot prioritizes your security and convenience by utilizing industry-standard Google OAuth for authentication. By leveraging Google’s secure identity platform, we ensure that you never have to create or manage another password, reducing the risk of credential theft and simplifying your onboarding experience.

Why Google OAuth?

• Zero-Knowledge Passwords: We never see or store your Google password. Authentication is handled entirely by Google’s secure servers.
• One-Tap Access: Get started in seconds with a familiar interface.
• Verified Identity: Your profile, including your email and display name, is automatically synced to personalize your dashboard from the first launch.

Secure Cloud Synchronization

Your reward strategies shouldn't be trapped on a single device. Credit Card Co-Pilot features a robust synchronization engine that ensures your wallet, transaction history, and milestone progress are always up to date, whether you are using your primary phone or a secondary tablet.

Cross-Device Continuity

Every card you add, every merchant you search for, and every milestone you track is securely synced to your private user profile. This means:

• Instant Recovery: If you switch devices or reinstall the app, simply signing back in with your Google account restores your entire credit card portfolio.
• Consistent Data: Your custom reward rules and spend limits remain identical across all your authorized devices.
• Encrypted Transit: All data moving between your device and our secure cloud storage is encrypted using industry-standard TLS protocols.

Scoped Permissions for Smart Ingestion

To provide the most accurate reward recommendations, the app can optionally sync transaction data from sources like Gmail or SMS. We adhere to the principle of Least Privilege, meaning we only request the specific permissions necessary to identify your spending patterns.

How Secure Sync Works for Ingestion:

1. User-Controlled Consent: You explicitly grant permission for the app to view only transaction-related data (e.g., bank receipts in Gmail).
2. Local Processing: Whenever possible, ingestion logic is performed on-device to minimize the amount of raw data sent to the cloud.
3. Transparent Status: The "Ingestion Status" dashboard gives you a clear view of when your last sync occurred and allows you to disconnect providers at any time with a single tap.

// Example of how the system tracks your secure connection status
interface IngestionConnectorStatus {
  provider: 'gmail' | 'sms';
  connected: boolean;
  lastSyncAt: number | null;
  consentGranted: boolean;
}

Privacy-First Architecture

We believe your financial data belongs to you. Our architecture is designed to keep your sensitive information private:

• Masked Data Storage: We only store the details necessary for reward calculation (such as the last 4 digits of a card and the bank name). We never store full card numbers (PANs) or CVVs.
• Offline-First Reliability: The app is designed to work even when you're offline. Your data is cached locally and synchronized the moment a secure connection is re-established, ensuring you never lose track of a transaction.
• Manual Override: You always have the final say. Our "Parser Review" feature allows you to audit and edit any synced transactions to ensure your data reflects your actual spending.

By combining the battle-tested security of Google with a transparent, user-centric sync architecture, Credit Card Co-Pilot provides a safe environment to manage and maximize your financial rewards.