User Registration at Trade Show - CBSubs

Person behind booth is not tech-savvy, I would like some way for the iPad to be connected to the sale (prevent human error)

Well it's a website so it's naturally connected. They should be logged into backend looking at CBSubs > Baskets page so they can confirm peoples payments. CBSubs and Joomla both have permissions to limit access. You should be able to more or less restrict them to just the payments page.

The alternative is they take down the username, email address, or phone number and have someone else later pay the baskets. Either way you need confirmation one way or another. It might be possible to put together a custom HTML form with custom PHP to pay the basket in a more simplified way, but you'd have to code that.

I suppose another option is to set offline payments to auto confirm. Then they'd just need to hand their money to whomever and go on through. Nobody would need to confirm anything. The only issue here would be this would require restricting access to the kiosks for the offline payment gateway.

It's the holidays here so I don't really have time to investigate a potential example until later next week. Easiest quick solution is probably just hide it with CSS and then use device specific CSS to show it again (e.g. browser extensions for custom CSS, etc..), but that's not entirely secure where the ideal solution would be some sort of device id verification.

Had another idea. You could configure the offline payments to auto confirm instead of going into a pending state. Next you can configure presentation tab emails, CBSubs Emails, OR CBSubs Mailer to send them an email confirming their payment. That email can have details like date, what payment method they used (e.g. offline cash or credit card, etc..), and whatever other details you need. Next they can show this payment confirmation email to whomever is managing entry. That person can then collect cash payment if the used offline cash payment method or let them through if used credit card.

I can't think of any other way to further minimize the workload as effectively you need a ticketing system and not necessarily a subscription system and often ticketing systems just do digital tickets that are shown with phone or printed and you can mimic that via email.