How about a reporting screen that captures real-time info on the amount of transactions that have taken place? For example, select a specific date-range in settings and a graph/chart summary screen  displays total $ transactions/counts that have come through MobilePay (let’s say it refreshes every few minutes).

We could report on specific note types as well in order to show breakdowns of various items for sale and the like. This way event staff can get real-time data on how an event is performing.

PCI should not be an issue since we are only reporting on the numbers going though MobilePay and not credit card info.