How to use barcode reader using usb shield

I want to using barcode reader to read item after enter the user id. Right now I have try to use the sketch that uses usb.task () in a void loop. But how to add other processes before and after reading the barcode?. I'm using a 1D standard barcode barcode reader.

Not enough information to provide a meaningful answer without lots of guess work.

Do yourself a favour and please read How to get the best out of this forum and add necessary documentation for your ask and your code with code tags.

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