I could see it being a case of scan, pass the phone back to child/whoever's with you (or scan it their side for them), then they're all registered on that accou

I could see it being a case of scan, pass the phone back to child/whoever's with you (or scan it their side for them), then they're all registered on that account. A bit like plane digital boarding cards. That does remove a potential fraud signal though so maybe they have a better idea.