The application is based on ZXing Barcode Scanner (https://github.com/zxing/zxing), but also gives you the ability to scan codes AZTEC with Polish registration documents.
When scanning, make sure the option to scan "AZTEC" is enabled in the settings. Try to keep your smartphone in such a way that the camera was parallel to the scanned code.
The source code is publicly available at: https://github.com/AnonimowiAnalitycy/Z3SBarcodeScanner
The application has the minimum permissions - access to the camera and the ability to read and write memory. Internet access is blocked and contacts, even though the original application requires it. Therefore, the functions available on some phones may not work.