Before this fix `_to_msat(item.price)` blindly did `price * 1000`,
treating any menu price as sat-denominated regardless of the item's
`currency` field. Quote and bolt11 were internally consistent but
charged ~0.1% of the real price for fiat-priced menus.
Big Jay's seeded with GTQ:
2× Tacos (Maíz, +Brisket, +Chicken)
pre-fix: 170 GTQ → 170000 msat → 170 sat invoice (~$0.14)
post-fix: 170 GTQ → 26968000 msat → 26968 sat invoice (~$22)
services.py:
- Drop `_to_msat` in favor of a `_price_to_msat(amount, currency)`
helper. Sat-aliased currencies ("sat", "sats", "satoshi",
"msat", …) take the flat ×1000 path; everything else round-
trips through lnbits.utils.exchange_rates.fiat_amount_as_satoshis
(same pool the events extension uses).
- Update _price_line_item: item.price AND each modifier.price_delta
are converted using item.currency. Modifier deltas inherit the
parent item's currency since we don't carry a per-modifier
currency field.
- Update quote_balance_required: same conversion via the item's
currency.
Verified live against the seeded "Big Jay's Bustaurant":
GTQ → sat conversion matches LNbits's bitcoin-price aggregate
(Binance / Blockchain / Bitfinex / Bitstamp / Coinbase / yadio).
Quote returns 26968 sats for 170 GTQ — within ~2% of expected
rate from external sources.
Add a navigable Obsidian vault as the project's first-class
technical documentation. Notes cross-reference with [[wikilinks]];
docs/index.md is the Map of Content.
New notes:
index.md MOC, entry point
architecture.md what the extension owns vs what lives outside
data-model.md entity-by-entity schema reference
menu-tree.md the arbitrary-depth tree concept
order-flow.md state machine + invoice listener + print
nostr-layer.md kinds 0/30402/5/1059, signing, t-tags
api-reference.md endpoint catalog by audience
cms.md Vue 3 + Quasar 2 UMD conventions, q-tree
webapp-integration.md multi-restaurant cart pattern + atomicity
glossary.md domain terms
Existing notes (kept as-is):
adr-0001-menu-tree.md the storage choice rationale
design-conversation.md trimmed transcript
README.md adds a Documentation section pointing at docs/index.md
with the headline note list. Each note links to ~3-5 others; the
vault forms a connected graph.
A project-level memory rule (saved outside the repo) commits us to
keeping these docs in sync as the code evolves: any commit that
materially changes schema, API, order flow, Nostr surface, CMS
conventions, or webapp integration must update the relevant note(s)
in the same commit.
