This memo from ICT ServiceDesk:

The database used by CSGold, which holds student Canterbury card balances, needs to be upgraded before CSGold itself is upgraded. The database upgrade will take about 2 hours, and will occur between 5pm and 7pm on Tuesday 23rd August.

EFTPOS stations, photocopier card-readers, and StudentWeb online fees payments and Canterbury card topups will be out-of-order/offline during the upgrade.