Closes gap 2 from coord log 2026-06-01T18:30Z. The LNbits withdraw
extension's nostr-transport RPC now populates `link.lnurl` from
`settings.lnbits_baseurl` (aiolabs/withdraw#1 / commit e9d911e), so the
ATM no longer needs a separate HTTP URL on the wire to compose the
LNURL-withdraw callback itself.
What goes:
- `VITE_LNBITS_HTTP_URL` env var (renderer + Electron main)
- `lnbitsHttpUrl` field on `LightningConfig`, `RuntimeConfig`, and the
Window mirror in `src/types/electron.d.ts`
- The manual `${lnbitsHttpUrl}/withdraw/api/v1/lnurl/${unique_hash}`
composition in `generateLnurlWithdraw`
- The `encodeLnurl` bech32 helper in `lightning.ts` (LNbits returns
bech32-encoded; we just `.toUpperCase()` to match BOLT/LNURL convention)
- `@scure/base` dep from `apps/machine/package.json` (only used by the
removed helper; clink still uses it directly)
- The `lnbitsHttpUrl` option + `LNBITS_HTTP_URL=…` env var + boot echo
in `deploy/nixos/bitspire-atm.nix`
- Doc references in CLAUDE.md, README.md, deploy/nixos/README.md,
docs/architecture-comparison.md, and the lightning-check skill
What stays:
- `link.lnurl` consumption, with an explicit error if LNbits returns
null (which signals `LNBITS_BASEURL` is unset on the server side —
better to fail clearly than silently)
- The receiver-side bech32 uppercasing (LNbits returns lowercase per
the standard library)
Why this is a net win:
- Removes a config-drift surface — if LNbits's external URL moved
(DNS, port, reverse-proxy rewrite), every ATM in the field would
stop issuing redeemable LNURL-withdraw QRs until reconfigured.
Now LNbits derives its own URL from `settings.lnbits_baseurl`,
one source of truth.
- Removes an extra provisioning step. No more `LNBITS_HTTP_URL=…`
before running `provision-atm.sh`; the relay + server pubkey suffice.
- Removes the misleading boot echo that triggered the §`18:30Z`
smoke triage confusion ("LNbits HTTP: <url>" read like ATM-→-LNbits
connectivity, when it was only ever a URL embedded in customer QRs).
Also adds a `# pragma: allowlist secret` marker above the
`VITE_ATM_PRIVATE_KEY` doc block in `.env.example` so the global
secret scanner stops false-positiving on the documentation prose.
Workspace typecheck + 24/24 apps/machine tests still green.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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