Ticket Scanning App Development

I'm looking for a developer to create a ticket scanning app for event entry. The app should integrate with an existing ticket sales website to validate tickets. Key Features: - Scan QR codes on phones or printed tickets - Mark tickets as used and show entry status - Fetch valid tickets from an external ticket sales service Ideal Skills: - Experience with QR code scanning - Familiarity with API integration - Mobile app development (iOS and Android)