The App may ask for iOS App Tracking Transparency permission before using data for advertising-campaign measurement. You may decline or change your choice at any time in **Settings > Privacy & Security > Tracking** on iOS. Declining permission does not prevent you from using the App’s basic scanning features.
## 3. How we use information
We use the information described above to:
- provide code scanning, creation, saving, exporting, and management features;
- process and restore Premium subscriptions;
- maintain security, diagnose issues, and improve performance and features;
- apply remote feature configuration;
- respond to support requests; and
- measure campaign effectiveness when you have allowed tracking.
## 4. How information is shared
We do not sell your personal information. We share information only as necessary with:
- **Apple**, for payments, subscriptions, purchase restoration, and system permissions;
- **Google Firebase**, for analytics and remote configuration when Firebase is enabled;
- **RevenueCat**, for subscription and transaction-status synchronization;
- **Open Food Facts**, for barcode-based product lookup; and
- public authorities when disclosure is legally required.
These third parties operate under their own terms and privacy policies.
## 5. Retention and security
Your codes, history, and project data remain on your device until you delete them or remove the App. Information handled by third-party services is retained according to the relevant service’s own retention practices.
We use reasonable measures to protect information. However, no electronic transmission or storage method is completely secure. Please do not scan or store sensitive information unless you accept the associated risks.
## 6. Your choices and rights
You may:
- decline or revoke Camera, Photos, Contacts, Calendar, and Tracking permissions in iOS Settings;
- delete saved content within the App;
- remove the App to remove App-local data; and
- contact us at **dangthixuanhuongdn@gmail.com** with questions about information handled by us or our providers.
## 7. Children’s privacy
The App is not designed to knowingly collect personal information from children. If you believe that a child has provided us with personal information, please contact us so that we can review the matter.
## 8. Changes to this Privacy Policy
We may update this Privacy Policy when the App, technology, or legal requirements change. We will post the updated version on this page and revise the effective date.
## 9. Contact
Email: **dangthixuanhuongdn@gmail.com**