static func generateQRCode(from string: String) -> UIImage? {

        let writer = ZXMultiFormatWriter()
        let hints = ZXEncodeHints()
        hints.gs1Format = true
        
        guard
            let result: ZXBitMatrix = try? writer.encode(
                string,
                format: kBarcodeFormatQRCode,
                width: 540,
                height: 540,
                hints: hints
            ),
            let image = ZXImage(matrix: result)?.cgimage else {
            return nil
        }
        
        return UIImage(cgImage: image)
    }