If you have iPads permanently installed, it may make sense to use a hand-held scanner for the iPad.
Then use the handheld scanner instead of the iPad camera.
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To install the scanner on the iPad, please follow the instructions of the respective manufacturer. 

If the scanner has been successfully installed on the iPad, you can integrate it directly into the keyline app by tapping on the scanner icon in the upper right corner of the main view and scanning the barcode with the scanner.

​Handheld scanners that are handy and compatible with the iPad can be found, for example, at https://www.socketmobile.com