firestore.rules

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    
    // Users collection - users can only access their own data
    match /users/{userId} {
      // Allow read/write only if authenticated and accessing own data
      allow read, write: if request.auth != null && request.auth.uid == userId;
      
      // Subscription history subcollection
      match /subscriptions/{purchaseToken} {
        // Users can read their own subscription history
        allow read: if request.auth != null && request.auth.uid == userId;
        
        // Only backend (Cloud Functions) can write subscriptions
        // This prevents client-side manipulation
        allow write: if false;
      }
    }
    
    // Deny all other access by default
    match /{document=**} {
      allow read, write: if false;
    }
  }
}