Tenants sign in at with their phone number to see, download and pay their bills.
Every power change, and what caused it.
Building and flat names, billing rules and optional time schedules.
Tenants see these names on the portal and on their bills.
How tenants pay from the tenant portal.
The lines that make up every flat's bill. "Same every month" charges are prefilled from each flat's own amount; "varies monthly" ones are typed in each month.
Optional time-of-day rules, independent of billing.