Phase 5 (invoice records the rate):
- repo::create_invoice_with_currency takes the listed currency,
listed value, exchange_rate_centibps, and exchange_rate_source as
optional params; create_invoice (the legacy form) becomes a thin
wrapper that passes None for all four. SAT-priced flows are
unchanged.
- purchase::start now branches on product.price_currency: SAT keeps
the existing path; USD/EUR calls rates::convert_to_sats and pins
the listed price + rate to the local invoice row for audit. The
buyer is still billed in BTC (BTCPay invoice is sat-denominated)
but the audit trail records what they SAW vs what they were
charged.
- Test paid_purchase_in_usd_records_listed_currency_and_rate seeds
a manual rate pin ($50k/BTC), creates a USD-priced product
($49.00), runs through purchase, asserts the invoice row carries
listed_currency='USD', listed_value=4900, rate_centibps=
500_000_000, source='manual_pin', amount_sats=98_000.
Phase 3 (buy page renders fiat):
- Server-rendered initial price respects product.price_currency:
USD products show "49.00 USD" (cents converted to display dollars)
instead of sats. Tier-picker JS still formats per-tier prices in
sats — that's a v0.3 polish when we plumb the rate into the JS
render path. Most operators ship single-policy products at first,
so the static initial render is the high-leverage piece.
Phase 6 (currency-aware discount codes):
- POST /v1/admin/discount-codes accepts optional `discount_currency`
field ('SAT' default, 'USD', 'EUR'). Whitelisted in the handler.
- repo::create_discount_code is now a thin wrapper around
create_discount_code_with_currency; the new helper persists
discount_currency to the column added in 0010. Existing SAT-only
codes keep working unchanged.
Test count: 37 (was 36; +1 paid_purchase_in_usd test).
Multi-currency design phases 1-6 all shipped (1: schema in :48; 2:
admin UI write in :48-:49; 3: buy page; 4: rate fetcher; 5: invoice
audit; 6: discount currency). Phase 7 (recurring subscriptions
re-quote) is v0.3 territory — needs the recurring-billing scaffolding
from Zaprite first.
Grant
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