xxx
If you go inside the qr code or link section, below the qr there should be a reset option.
You can use a link as many times as you want to he contacted.
When you reset it a new link and a new qr code are generating, voiding the other ones.
You will need to share the new link once you reset it.
If you try to click on the old link you should be prompted with a message saying
"This link is no longer valid"
Or something like that
I don' t know if I am being redundant or helping out
Hope the second :)