I would suggest that you use your phone. Go green and all
Just show it on your phone. They scan the little barcode. Super easy.
Itcs always best to print since they have to grab them and scan the bar code. With the phone you have to hand it to them so they can scan it, it is possible but I donct want no one handling mu phone but you can still do it if that's the only option for you.
You can show on your phone.
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