Unified Pricing & Tax
One calculation path turns any sellable into a computed Price value object carrying net, per-rate tax and gross in one operating currency.
PriceFactory
There is exactly one way to price something:
from vbwd.pricing import PriceFactory
price = PriceFactory.get_price_from_object(sellable)
price.netto # net amount (Decimal, never rounded)
price.taxes # per-rate tax breakdown
price.brutto # gross amount
price.currency # the single operating currencyAny object that implements the Priceable protocol can be priced — subscriptions, add-ons, products, bookings.
The Price value object
Price is a computed value object: net, per-rate taxes, gross and currency. Values are never rounded internally (rounding happens once, at the display/charge edge) so totals reconcile to the cent.
Storage & currency
Sellables store a single price float plus a prices_mode_in_db flag that says whether the stored number is net or gross. A single default_currency (exposed at GET /api/v1/config) is the operating currency; everything bills in it. A fe-user display-currency switch converts for display only via the admin rate sheet — it never changes what is charged.
Invoices & discounts
Invoice views aggregate a per-line tax_breakdown (net/gross from invoice totals). A discount therefore carries a negative per-rate tax_breakdown so the generic invoice views reconcile: the discount reduces net and tax is recomputed on the discounted net.