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feat(lnd): accept amount_sats on lnd.payinvoice for zero-amount invoices

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Zero-amount BOLT11 invoices need the payer to supply the amount; forward
it to LND REST as the amt field. The wallet scan modal unlocks its amount
field for such invoices and passes the user's entry through.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
archipelago
2026-07-21 13:15:35 -04:00
co-authored by Claude Fable 5
parent 0213da3fc5
commit 1b78da1d7a
1 changed files with 8 additions and 1 deletions
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core/archipelago/src/api/rpc/lnd/payments.rs
+8 -1
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@@ -28,13 +28,20 @@ impl RpcHandler {
)); ));
} }
// Zero-amount invoices need the amount supplied by the payer; LND's
// REST API takes it as an `amt` string alongside the payment request.
let amount_sats = params.get("amount_sats").and_then(|v| v.as_u64());
info!("Paying Lightning invoice"); info!("Paying Lightning invoice");
let (client, macaroon_hex) = self.lnd_client().await?; let (client, macaroon_hex) = self.lnd_client().await?;
let pay_body = serde_json::json!({ let mut pay_body = serde_json::json!({
"payment_request": payment_request, "payment_request": payment_request,
}); });
if let Some(amt) = amount_sats {
pay_body["amt"] = serde_json::json!(amt.to_string());
}
let resp = client let resp = client
.post(format!("{LND_REST_BASE_URL}/v1/channels/transactions")) .post(format!("{LND_REST_BASE_URL}/v1/channels/transactions"))