Billing
Doorcom is priced per claimed flat: 1.50 GBP a month for each flat that has at least one resident signed up, with a 15 GBP minimum per building. The Billing page shows the numbers; it does not raise invoices.
Claimed flats
A flat is claimed from the moment a resident signs up for it until the last resident moves out, when it goes back to available. Disabled flats and empty flats do not count. The dashboard shows the current count ("3 / 24 flats claimed").
Snapshots
On the first of each month the service records, for every building, how many flats are claimed. The snapshot is taken by the background loop, so nothing needs to be run by hand; Snapshot billing now on Settings records the current month early if you want to see it. One snapshot per building per month.
The Billing page
Billing (/billing, owners only, reached from Settings or the Buildings page) lists each building with its claimed flats now and the amount that makes, then the last twelve monthly snapshots with their counts and amounts. The amount is claimed flats times 1.50 GBP, or 15.00 GBP when that is less.
CSV
Export CSV (/billing.csv) gives one row per building for now and one per snapshot month, with the columns building, slug, month, claimed_flats and amount_gbp. This is what goes to the accounts system.
Paying
Accounts run as a trial until the Direct Debit is set up. Direct Debit through QuickFile is coming; until then you are invoiced from the same figures. See Pricing.