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Hold this up. They scan it, land on your card, and save your details. No app on their side, nothing to hand over.
innov8.net.au/marcus
Turn the screen brightness up if it will not scan.
Two things worth doing once
Save the QR image to your Gallery and mark it a favourite, so it is two taps away when the phone has no signal.
A blank NFC sticker costs a couple of dollars. Write innov8.net.au/marcus to it with any NFC writer app and the back of your phone becomes the tap-to-share card, without the subscription.