fix: manual Lightning payment reconciliation with Stripe invoice state (#54)

Reviewed-on: coracle/caravel#54
Co-authored-by: userAdityaa <aditya.chaudhary1558@gmail.com>
Co-committed-by: userAdityaa <aditya.chaudhary1558@gmail.com>

backend/.env.template

@@ -28,5 +28,6 @@ LIVEKIT_API_SECRET=
 
 # Billing
 NWC_URL=                      # Nostr Wallet Connect URL for generating Lightning invoices
+ENCRYPTION_SECRET=            # Nostr secret key (hex or nsec) used for NIP-44 encryption of tenant nwc_url at rest
 STRIPE_SECRET_KEY=            # Required Stripe API secret key (sk_...)
 STRIPE_WEBHOOK_SECRET=whsec_test_00000000000000000000000000  # Webhook signing secret (use real value in production)

backend/README.md

@@ -30,29 +30,30 @@ backend/
 
 Environment variables:
 
-| Variable                 | Description                                                             | Default                              |
-| ------------------------ | ----------------------------------------------------------------------- | ------------------------------------ |
-| `DATABASE_URL`           | SQLite URL. Relative paths are resolved under `backend/`.               | `sqlite://<backend>/data/caravel.db` |
-| `HOST`                   | API bind host (also used for NIP-98 `u` host check)                     | `127.0.0.1`                          |
-| `PORT`                   | API bind port                                                           | `2892`                               |
-| `ADMINS`                 | Comma-separated admin pubkeys (hex)                                     | _optional_                           |
-| `ALLOW_ORIGINS`          | Comma-separated CORS origins. If empty, CORS is permissive.             | _optional_                           |
-| `ZOOID_API_URL`          | Zooid API base URL used by infra worker                                 | _required for infra sync_            |
-| `ZOOID_API_SECRET`       | Nostr secret key used for authentication of requests to the zooid API   | _required_                           |
-| `RELAY_DOMAIN`           | Base domain appended to relay subdomains                                | empty                                |
-| `LIVEKIT_URL`            | LiveKit URL sent to zooid when relay livekit is enabled                 | _optional_                           |
-| `LIVEKIT_API_KEY`        | LiveKit API key sent to zooid                                           | _optional_                           |
-| `LIVEKIT_API_SECRET`     | LiveKit API secret sent to zooid                                        | _optional_                           |
-| `NWC_URL`                | Platform NWC URL used to generate BOLT11 invoices                       | _required for invoice generation_    |
-| `STRIPE_SECRET_KEY`      | Stripe API secret key used for billing API operations                   | _required_                           |
-| `STRIPE_WEBHOOK_SECRET`  | Stripe webhook signing secret used to verify `Stripe-Signature` headers | _required_                           |
-| `ROBOT_SECRET`           | Robot Nostr secret key                                                  | _required_                           |
-| `ROBOT_NAME`             | Robot display name (kind `0`)                                           | _optional_                           |
-| `ROBOT_DESCRIPTION`      | Robot description (kind `0`)                                            | _optional_                           |
-| `ROBOT_PICTURE`          | Robot picture URL (kind `0`)                                            | _optional_                           |
-| `ROBOT_OUTBOX_RELAYS`    | Comma-separated relays published as kind `10002`                        | _required_                           |
-| `ROBOT_INDEXER_RELAYS`   | Comma-separated relays used for recipient relay discovery               | _required_                           |
-| `ROBOT_MESSAGING_RELAYS` | Comma-separated relays published as kind `10050`                        | _required_                           |
+| Variable                 | Description                                                                             | Default                                  |
+| ------------------------ | --------------------------------------------------------------------------------------- | ---------------------------------------- |
+| `DATABASE_URL`           | SQLite URL. Relative paths are resolved under `backend/`.                               | `sqlite://<backend>/data/caravel.db`     |
+| `HOST`                   | API bind host (also used for NIP-98 `u` host check)                                     | `127.0.0.1`                              |
+| `PORT`                   | API bind port                                                                           | `2892`                                   |
+| `ADMINS`                 | Comma-separated admin pubkeys (hex)                                                     | _optional_                               |
+| `ALLOW_ORIGINS`          | Comma-separated CORS origins. If empty, CORS is permissive.                             | _optional_                               |
+| `ZOOID_API_URL`          | Zooid API base URL used by infra worker                                                 | _required for infra sync_                |
+| `ZOOID_API_SECRET`       | Nostr secret key used for authentication of requests to the zooid API                   | _required_                               |
+| `RELAY_DOMAIN`           | Base domain appended to relay subdomains                                                | empty                                    |
+| `LIVEKIT_URL`            | LiveKit URL sent to zooid when relay livekit is enabled                                 | _optional_                               |
+| `LIVEKIT_API_KEY`        | LiveKit API key sent to zooid                                                           | _optional_                               |
+| `LIVEKIT_API_SECRET`     | LiveKit API secret sent to zooid                                                        | _optional_                               |
+| `NWC_URL`                | Platform NWC URL used to generate BOLT11 invoices                                       | _required for invoice generation_        |
+| `ENCRYPTION_SECRET`      | Nostr secret key (hex or `nsec`) used for NIP-44 encryption of tenant `nwc_url` at rest | _required when tenant `nwc_url` is used_ |
+| `STRIPE_SECRET_KEY`      | Stripe API secret key used for billing API operations                                   | _required_                               |
+| `STRIPE_WEBHOOK_SECRET`  | Stripe webhook signing secret used to verify `Stripe-Signature` headers                 | _required_                               |
+| `ROBOT_SECRET`           | Robot Nostr secret key                                                                  | _required_                               |
+| `ROBOT_NAME`             | Robot display name (kind `0`)                                                           | _optional_                               |
+| `ROBOT_DESCRIPTION`      | Robot description (kind `0`)                                                            | _optional_                               |
+| `ROBOT_PICTURE`          | Robot picture URL (kind `0`)                                                            | _optional_                               |
+| `ROBOT_OUTBOX_RELAYS`    | Comma-separated relays published as kind `10002`                                        | _required_                               |
+| `ROBOT_INDEXER_RELAYS`   | Comma-separated relays used for recipient relay discovery                               | _required_                               |
+| `ROBOT_MESSAGING_RELAYS` | Comma-separated relays published as kind `10050`                                        | _required_                               |
 
 Relay list env vars are comma-separated and trimmed. If a relay has no `ws://` or `wss://` scheme, `wss://` is prepended.
 

backend/migrations/0003_invoice_nwc_payment_guard.sql

@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS invoice_nwc_payment (
+  invoice_id TEXT PRIMARY KEY,
+  tenant_pubkey TEXT NOT NULL,
+  state TEXT NOT NULL CHECK (state IN ('pending', 'paid')),
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  FOREIGN KEY (tenant_pubkey) REFERENCES tenant(pubkey)
+);
+
+CREATE INDEX IF NOT EXISTS idx_invoice_nwc_payment_tenant_pubkey
+ON invoice_nwc_payment (tenant_pubkey);

backend/migrations/0004_invoice_manual_lightning_payment.sql

@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS invoice_manual_lightning_payment (
+  invoice_id TEXT PRIMARY KEY,
+  tenant_pubkey TEXT NOT NULL,
+  bolt11 TEXT NOT NULL,
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  FOREIGN KEY (tenant_pubkey) REFERENCES tenant(pubkey)
+);
+
+CREATE INDEX IF NOT EXISTS idx_invoice_manual_lightning_payment_tenant_pubkey
+ON invoice_manual_lightning_payment (tenant_pubkey);

backend/spec/infra.md

@@ -15,12 +15,15 @@ Members:
 ## `pub async fn start(self)`
 
 - Subscribes to `command.notify`
+- On startup, schedules delayed sync retries for relays whose `sync_error` is non-empty.
 - Loops on `rx.recv()`, calling `handle_activity` for each received `Activity`.
 
 ## `async fn handle_activity(&self, activity: &Activity)`
 
-- For `create_relay`, `update_relay`, `activate_relay`, or `deactivate_relay` activity, calls `sync_and_report`.
-- All other activity types are ignored (e.g. `fail_relay_sync`, `complete_relay_sync`).
+- For `create_relay`, `update_relay`, `activate_relay`, or `deactivate_relay` activity, calls `sync_and_report` immediately.
+- For `fail_relay_sync`, schedules a delayed retry using exponential backoff based on consecutive failures for the relay.
+- Retry scheduling stops after the configured max attempts to avoid infinite retry loops.
+- Other activity types are ignored (e.g. `complete_relay_sync`).
 
 ## `async fn sync_and_report(&self, relay: &Relay, is_new: bool)`
 

backend/src/api.rs

@@ -445,6 +445,17 @@ struct IdentityResponse {
     is_admin: bool,
 }
 
+#[derive(Serialize)]
+struct TenantResponse {
+    pubkey: String,
+    nwc_configured: bool,
+    nwc_error: Option<String>,
+    created_at: i64,
+    stripe_customer_id: String,
+    stripe_subscription_id: Option<String>,
+    past_due_at: Option<i64>,
+}
+
 #[derive(Deserialize)]
 struct CreateRelayRequest {
     tenant: String,
@@ -486,7 +497,7 @@ async fn list_tenants(
     state.api.require_admin(&pubkey)?;
 
     match state.api.query.list_tenants().await {
-        Ok(tenants) => Ok(ok(StatusCode::OK, tenants)),
+        Ok(tenants) => Ok(ok(StatusCode::OK, scrub_tenants_for_response(tenants))),
         Err(e) => Ok(err(
             StatusCode::INTERNAL_SERVER_ERROR,
             "internal",
@@ -515,7 +526,7 @@ async fn create_tenant(
     let pubkey = state.api.extract_auth_pubkey(&headers)?;
 
     match state.api.query.get_tenant(&pubkey).await {
-        Ok(Some(t)) => Ok(ok(StatusCode::OK, t)),
+        Ok(Some(t)) => Ok(ok(StatusCode::OK, scrub_tenant_for_response(t))),
         Ok(None) => {
             let stripe_customer_id = match state.api.billing.stripe_create_customer(&pubkey).await {
                 Ok(id) => id,
@@ -539,10 +550,10 @@ async fn create_tenant(
             };
 
             match state.api.command.create_tenant(&tenant).await {
-                Ok(()) => Ok(ok(StatusCode::OK, tenant)),
+                Ok(()) => Ok(ok(StatusCode::OK, scrub_tenant_for_response(tenant))),
                 Err(e) if matches!(map_unique_error(&e), Some("pubkey-exists")) => {
                     match state.api.query.get_tenant(&pubkey).await {
-                        Ok(Some(t)) => Ok(ok(StatusCode::OK, t)),
+                        Ok(Some(t)) => Ok(ok(StatusCode::OK, scrub_tenant_for_response(t))),
                         Ok(None) => Ok(err(
                             StatusCode::INTERNAL_SERVER_ERROR,
                             "internal",
@@ -585,7 +596,7 @@ async fn get_tenant(
     let auth = state.api.extract_auth_pubkey(&headers)?;
     state.api.require_admin_or_tenant(&auth, &pubkey)?;
     let tenant = state.api.get_tenant_or_404(&pubkey).await?;
-    Ok(ok(StatusCode::OK, tenant))
+    Ok(ok(StatusCode::OK, scrub_tenant_for_response(tenant)))
 }
 
 async fn list_relays(
@@ -1009,6 +1020,13 @@ async fn get_invoice(
         .map_err(map_invoice_lookup_error)?;
     state.api.require_admin_or_tenant(&auth, &tenant.pubkey)?;
 
+    let invoice = state
+        .api
+        .billing
+        .reconcile_manual_lightning_invoice(&id, &invoice)
+        .await
+        .map_err(map_invoice_lookup_error)?;
+
     Ok(ok(StatusCode::OK, invoice))
 }
 
@@ -1026,6 +1044,13 @@ async fn get_invoice_bolt11(
         .map_err(map_invoice_lookup_error)?;
     state.api.require_admin_or_tenant(&auth, &tenant.pubkey)?;
 
+    let invoice = state
+        .api
+        .billing
+        .reconcile_manual_lightning_invoice(&id, &invoice)
+        .await
+        .map_err(map_invoice_lookup_error)?;
+
     let status = invoice["status"].as_str().unwrap_or_default();
     if status != "open" {
         return Ok(err(
@@ -1038,7 +1063,12 @@ async fn get_invoice_bolt11(
     let amount_due = invoice["amount_due"].as_i64().unwrap_or(0);
     let currency = invoice["currency"].as_str().unwrap_or("usd");
 
-    match state.api.billing.create_bolt11(amount_due, currency).await {
+    match state
+        .api
+        .billing
+        .get_or_create_manual_lightning_bolt11(&id, &tenant.pubkey, amount_due, currency)
+        .await
+    {
         Ok(bolt11) => Ok(ok(StatusCode::OK, serde_json::json!({ "bolt11": bolt11 }))),
         Err(e) => Ok(err(
             StatusCode::INTERNAL_SERVER_ERROR,
@@ -1103,7 +1133,7 @@ async fn update_tenant(
                     }
                 });
             }
-            Ok(ok(StatusCode::OK, tenant))
+            Ok(ok(StatusCode::OK, scrub_tenant_for_response(tenant)))
         }
         Err(e) => Ok(err(
             StatusCode::INTERNAL_SERVER_ERROR,
@@ -1112,3 +1142,19 @@ async fn update_tenant(
         )),
     }
 }
+
+fn scrub_tenant_for_response(tenant: Tenant) -> TenantResponse {
+    TenantResponse {
+        pubkey: tenant.pubkey,
+        nwc_configured: !tenant.nwc_url.is_empty(),
+        nwc_error: tenant.nwc_error,
+        created_at: tenant.created_at,
+        stripe_customer_id: tenant.stripe_customer_id,
+        stripe_subscription_id: tenant.stripe_subscription_id,
+        past_due_at: tenant.past_due_at,
+    }
+}
+
+fn scrub_tenants_for_response(tenants: Vec<Tenant>) -> Vec<TenantResponse> {
+    tenants.into_iter().map(scrub_tenant_for_response).collect()
+}

backend/src/billing.rs

@@ -1,7 +1,8 @@
 use anyhow::{Result, anyhow};
 use hmac::{Hmac, Mac};
 use nwc::prelude::{
-    MakeInvoiceRequest, NWC, NostrWalletConnectURI, PayInvoiceRequest as NwcPayInvoiceRequest,
+    LookupInvoiceRequest, LookupInvoiceResponse, MakeInvoiceRequest, NWC, NostrWalletConnectURI,
+    PayInvoiceRequest as NwcPayInvoiceRequest, TransactionState,
 };
 use sha2::Sha256;
 
@@ -17,6 +18,9 @@ type HmacSha256 = Hmac<Sha256>;
 const STRIPE_API: &str = "https://api.stripe.com/v1";
 const COINBASE_SPOT_API: &str = "https://api.coinbase.com/v2/prices";
 const WEBHOOK_TOLERANCE_SECS: i64 = 300;
+const MANUAL_LIGHTNING_PAYMENT_DM: &str = "Payment is due for your relay subscription. Please visit the application to complete a manual Lightning payment.";
+const NWC_ERROR_DM_PREFIX: &str = "NWC auto-payment failed:";
+const NWC_ERROR_DM_MAX_CHARS: usize = 240;
 
 #[derive(Debug)]
 pub enum InvoiceLookupError {
@@ -75,12 +79,17 @@ struct CoinbaseSpotPriceData {
     amount: String,
 }
 
+enum NwcInvoicePaymentOutcome {
+    Paid,
+    Fallback(anyhow::Error),
+    Pending(anyhow::Error),
+}
+
 #[derive(Clone)]
 pub struct Billing {
     nwc_url: String,
     stripe_secret_key: String,
     stripe_webhook_secret: String,
-    btc_quote_api_base: String,
     http: reqwest::Client,
     query: Query,
     command: Command,
@@ -98,13 +107,10 @@ impl Billing {
         if stripe_webhook_secret.trim().is_empty() {
             panic!("missing STRIPE_WEBHOOK_SECRET environment variable");
         }
-        let btc_quote_api_base =
-            std::env::var("BTC_PRICE_API_BASE").unwrap_or_else(|_| COINBASE_SPOT_API.to_string());
         Self {
             nwc_url,
             stripe_secret_key,
             stripe_webhook_secret,
-            btc_quote_api_base,
             http: reqwest::Client::new(),
             query,
             command,
@@ -115,6 +121,10 @@ impl Billing {
     pub async fn start(self) {
         let mut rx = self.command.notify.subscribe();
 
+        if let Err(error) = self.reconcile_relay_subscriptions("startup").await {
+            tracing::error!(error = %error, "failed to reconcile relay billing state on startup");
+        }
+
         loop {
             match rx.recv().await {
                 Ok(activity) => {
@@ -124,12 +134,43 @@ impl Billing {
                 }
                 Err(tokio::sync::broadcast::error::RecvError::Lagged(n)) => {
                     tracing::warn!(missed = n, "billing lagged");
+
+                    if let Err(error) = self.reconcile_relay_subscriptions("lagged").await {
+                        tracing::error!(error = %error, "failed to reconcile relay billing state after lag");
+                    }
                 }
                 Err(tokio::sync::broadcast::error::RecvError::Closed) => break,
             }
         }
     }
 
+    async fn reconcile_relay_subscriptions(&self, source: &str) -> Result<()> {
+        let relays = self.query.list_relays().await?;
+
+        if relays.is_empty() {
+            return Ok(());
+        }
+
+        tracing::info!(
+            source,
+            relay_count = relays.len(),
+            "reconciling relay billing state"
+        );
+
+        for relay in relays {
+            if let Err(error) = self.sync_relay_subscription_for_relay(&relay).await {
+                tracing::error!(
+                    source,
+                    relay = %relay.id,
+                    error = %error,
+                    "failed to reconcile relay billing state"
+                );
+            }
+        }
+
+        Ok(())
+    }
+
     async fn handle_activity(&self, activity: &Activity) -> Result<()> {
         let needs_billing_sync = matches!(
             activity.activity_type.as_str(),
@@ -153,6 +194,10 @@ impl Billing {
             return Ok(());
         };
 
+        self.sync_relay_subscription_for_relay(&relay).await
+    }
+
+    async fn sync_relay_subscription_for_relay(&self, relay: &Relay) -> Result<()> {
         let Some(tenant) = self.query.get_tenant(&relay.tenant).await? else {
             return Ok(());
         };
@@ -261,6 +306,23 @@ impl Billing {
         Ok(())
     }
 
+    async fn existing_invoice_nwc_payment_outcome(
+        &self,
+        invoice_id: &str,
+    ) -> Result<Option<NwcInvoicePaymentOutcome>> {
+        let state = self.query.get_invoice_nwc_payment_state(invoice_id).await?;
+        match state.as_deref() {
+            Some("paid") => Ok(Some(NwcInvoicePaymentOutcome::Paid)),
+            Some("pending") => Ok(Some(NwcInvoicePaymentOutcome::Pending(anyhow!(
+                "invoice {invoice_id} has a pending NWC reconciliation; refusing to create a new Lightning charge"
+            )))),
+            Some(other) => Err(anyhow!(
+                "unknown invoice_nwc_payment state '{other}' for invoice {invoice_id}"
+            )),
+            None => Ok(None),
+        }
+    }
+
     pub async fn handle_webhook(&self, payload: &str, signature: &str) -> Result<()> {
         self.verify_webhook_signature(payload, signature)?;
 
@@ -360,24 +422,54 @@ impl Billing {
             return Ok(());
         };
 
+        let mut nwc_error_for_dm: Option<String> = None;
+
         // 1. NWC auto-pay: if the tenant has a nwc_url
         if !tenant.nwc_url.is_empty() {
             match self
-                .nwc_pay_invoice(amount_due, currency, &tenant.nwc_url)
-                .await
+                .nwc_pay_invoice(
+                    invoice_id,
+                    &tenant.pubkey,
+                    amount_due,
+                    currency,
+                    &tenant.nwc_url,
+                )
+                .await?
             {
-                Ok(()) => {
-                    self.stripe_pay_invoice_out_of_band(invoice_id).await?;
-                    self.command.clear_tenant_nwc_error(&tenant.pubkey).await?;
+                NwcInvoicePaymentOutcome::Paid => {
+                    self.mark_invoice_paid_out_of_band_after_nwc(invoice_id, &tenant.pubkey)
+                        .await?;
                     return Ok(());
                 }
-                Err(e) => {
+                NwcInvoicePaymentOutcome::Fallback(e) => {
                     let error_msg = format!("{e}");
                     self.command
                         .set_tenant_nwc_error(&tenant.pubkey, &error_msg)
                         .await?;
+                    tracing::warn!(
+                        error = %e,
+                        tenant_pubkey = %tenant.pubkey,
+                        stripe_customer_id,
+                        invoice_id,
+                        "nwc auto-payment failed for invoice.created"
+                    );
+                    nwc_error_for_dm = summarize_nwc_error_for_dm(&error_msg);
                     // Fall through to next option
                 }
+                NwcInvoicePaymentOutcome::Pending(e) => {
+                    let error_msg = format!("{e}");
+                    self.command
+                        .set_tenant_nwc_error(&tenant.pubkey, &error_msg)
+                        .await?;
+                    tracing::error!(
+                        error = %e,
+                        tenant_pubkey = %tenant.pubkey,
+                        stripe_customer_id,
+                        invoice_id,
+                        "nwc auto-payment requires reconciliation before retry"
+                    );
+                    return Err(e);
+                }
             }
         }
 
@@ -390,12 +482,8 @@ impl Billing {
         }
 
         // 3. Manual payment: send a DM
-        self.robot
-            .send_dm(
-                &tenant.pubkey,
-                "Payment is due for your relay subscription. Please visit the application to complete a manual Lightning payment.",
-            )
-            .await?;
+        let dm_message = manual_lightning_payment_dm(nwc_error_for_dm.as_deref());
+        self.robot.send_dm(&tenant.pubkey, &dm_message).await?;
 
         Ok(())
     }
@@ -635,14 +723,60 @@ impl Billing {
         Ok((invoice, tenant))
     }
 
+    pub async fn reconcile_manual_lightning_invoice(
+        &self,
+        invoice_id: &str,
+        invoice: &serde_json::Value,
+    ) -> std::result::Result<serde_json::Value, InvoiceLookupError> {
+        self.reconcile_manual_lightning_invoice_if_settled(invoice_id, invoice)
+            .await
+    }
+
+    pub async fn get_or_create_manual_lightning_bolt11(
+        &self,
+        invoice_id: &str,
+        tenant_pubkey: &str,
+        amount_due_minor: i64,
+        currency: &str,
+    ) -> Result<String> {
+        if let Some(existing_bolt11) = self
+            .query
+            .get_invoice_manual_lightning_bolt11(invoice_id)
+            .await?
+        {
+            return Ok(existing_bolt11);
+        }
+
+        let bolt11 = self.create_bolt11(amount_due_minor, currency).await?;
+
+        if self
+            .command
+            .insert_manual_lightning_invoice_payment(invoice_id, tenant_pubkey, &bolt11)
+            .await?
+        {
+            return Ok(bolt11);
+        }
+
+        self.query
+            .get_invoice_manual_lightning_bolt11(invoice_id)
+            .await?
+            .ok_or_else(|| {
+                anyhow!(
+                    "manual lightning payment row missing after insert race for invoice {invoice_id}"
+                )
+            })
+    }
+
     pub async fn stripe_create_customer(&self, tenant_pubkey: &str) -> Result<String> {
         let short_pubkey: String = tenant_pubkey.chars().take(12).collect();
         let display_name = format!("Caravel tenant {short_pubkey}");
+        let idempotency_key = self.idempotency_key(&["create_customer", tenant_pubkey]);
 
         let resp = self
             .http
             .post(format!("{STRIPE_API}/customers"))
             .bearer_auth(&self.stripe_secret_key)
+            .header("Idempotency-Key", idempotency_key)
             .form(&[
                 ("name", display_name.as_str()),
                 ("metadata[tenant_pubkey]", tenant_pubkey),
@@ -743,21 +877,28 @@ impl Billing {
             }
 
             match self
-                .nwc_pay_invoice(amount_due, currency, &tenant.nwc_url)
-                .await
+                .nwc_pay_invoice(
+                    invoice_id,
+                    &tenant.pubkey,
+                    amount_due,
+                    currency,
+                    &tenant.nwc_url,
+                )
+                .await?
             {
-                Ok(()) => {
-                    if let Err(e) = self.stripe_pay_invoice_out_of_band(invoice_id).await {
+                NwcInvoicePaymentOutcome::Paid => {
+                    if let Err(e) = self
+                        .mark_invoice_paid_out_of_band_after_nwc(invoice_id, &tenant.pubkey)
+                        .await
+                    {
                         tracing::error!(
                             error = %e,
                             invoice_id,
                             "failed to mark invoice paid out of band"
                         );
-                    } else {
-                        let _ = self.command.clear_tenant_nwc_error(&tenant.pubkey).await;
                     }
                 }
-                Err(e) => {
+                NwcInvoicePaymentOutcome::Fallback(e) => {
                     let error_msg = format!("{e}");
                     tracing::error!(
                         error = %e,
@@ -769,6 +910,18 @@ impl Billing {
                         .set_tenant_nwc_error(&tenant.pubkey, &error_msg)
                         .await;
                 }
+                NwcInvoicePaymentOutcome::Pending(e) => {
+                    let error_msg = format!("{e}");
+                    tracing::error!(
+                        error = %e,
+                        invoice_id,
+                        "outstanding invoice requires NWC reconciliation before retry"
+                    );
+                    let _ = self
+                        .command
+                        .set_tenant_nwc_error(&tenant.pubkey, &error_msg)
+                        .await;
+                }
             }
         }
 
@@ -829,15 +982,29 @@ impl Billing {
 
     // --- Stripe API helpers ---
 
+    fn idempotency_key(&self, parts: &[&str]) -> String {
+        let mut mac = HmacSha256::new_from_slice(self.stripe_secret_key.as_bytes())
+            .expect("HMAC accepts any key length");
+        for (i, part) in parts.iter().enumerate() {
+            if i > 0 {
+                mac.update(b":");
+            }
+            mac.update(part.as_bytes());
+        }
+        hex::encode(mac.finalize().into_bytes())
+    }
+
     async fn stripe_create_subscription(
         &self,
         customer_id: &str,
         price_id: &str,
     ) -> Result<(String, String)> {
+        let idempotency_key = self.idempotency_key(&["create_subscription", customer_id, price_id]);
         let resp = self
             .http
             .post(format!("{STRIPE_API}/subscriptions"))
             .bearer_auth(&self.stripe_secret_key)
+            .header("Idempotency-Key", idempotency_key)
             .form(&[
                 ("customer", customer_id),
                 ("collection_method", "charge_automatically"),
@@ -864,10 +1031,13 @@ impl Billing {
         subscription_id: &str,
         price_id: &str,
     ) -> Result<String> {
+        let idempotency_key =
+            self.idempotency_key(&["create_subscription_item", subscription_id, price_id]);
         let resp = self
             .http
             .post(format!("{STRIPE_API}/subscription_items"))
             .bearer_auth(&self.stripe_secret_key)
+            .header("Idempotency-Key", idempotency_key)
             .form(&[("subscription", subscription_id), ("price", price_id)])
             .send()
             .await?;
@@ -886,10 +1056,13 @@ impl Billing {
         item_id: &str,
         price_id: &str,
     ) -> Result<String> {
+        let idempotency_key =
+            self.idempotency_key(&["update_subscription_item", item_id, price_id]);
         let resp = self
             .http
             .post(format!("{STRIPE_API}/subscription_items/{item_id}"))
             .bearer_auth(&self.stripe_secret_key)
+            .header("Idempotency-Key", idempotency_key)
             .form(&[("price", price_id)])
             .send()
             .await?;
@@ -926,9 +1099,11 @@ impl Billing {
     }
 
     async fn stripe_pay_invoice(&self, invoice_id: &str) -> Result<()> {
+        let idempotency_key = self.idempotency_key(&["pay_invoice", invoice_id]);
         self.http
             .post(format!("{STRIPE_API}/invoices/{invoice_id}/pay"))
             .bearer_auth(&self.stripe_secret_key)
+            .header("Idempotency-Key", idempotency_key)
             .send()
             .await?
             .error_for_status()?;
@@ -968,9 +1143,11 @@ impl Billing {
     }
 
     async fn stripe_pay_invoice_out_of_band(&self, invoice_id: &str) -> Result<()> {
+        let idempotency_key = self.idempotency_key(&["pay_invoice_oob", invoice_id]);
         self.http
             .post(format!("{STRIPE_API}/invoices/{invoice_id}/pay"))
             .bearer_auth(&self.stripe_secret_key)
+            .header("Idempotency-Key", idempotency_key)
             .form(&[("paid_out_of_band", "true")])
             .send()
             .await?
@@ -999,19 +1176,113 @@ impl Billing {
 
     // --- NWC helpers ---
 
+    async fn mark_invoice_paid_out_of_band_after_nwc(
+        &self,
+        invoice_id: &str,
+        tenant_pubkey: &str,
+    ) -> Result<()> {
+        self.stripe_pay_invoice_out_of_band(invoice_id).await?;
+        self.command.clear_tenant_nwc_error(tenant_pubkey).await?;
+        Ok(())
+    }
+
+    async fn reconcile_manual_lightning_invoice_if_settled(
+        &self,
+        invoice_id: &str,
+        invoice: &serde_json::Value,
+    ) -> std::result::Result<serde_json::Value, InvoiceLookupError> {
+        if invoice["status"].as_str().unwrap_or_default() != "open" {
+            return Ok(invoice.clone());
+        }
+
+        let Some(bolt11) = self
+            .query
+            .get_invoice_manual_lightning_bolt11(invoice_id)
+            .await?
+        else {
+            return Ok(invoice.clone());
+        };
+
+        let settled = match self.is_manual_lightning_invoice_settled(&bolt11).await {
+            Ok(settled) => settled,
+            Err(error) => {
+                tracing::warn!(
+                    error = %error,
+                    invoice_id,
+                    "failed to lookup manual lightning invoice settlement"
+                );
+                return Ok(invoice.clone());
+            }
+        };
+
+        if !settled {
+            return Ok(invoice.clone());
+        }
+
+        if let Err(error) = self.stripe_pay_invoice_out_of_band(invoice_id).await {
+            tracing::warn!(
+                error = %error,
+                invoice_id,
+                "failed to mark settled manual lightning invoice as paid_out_of_band"
+            );
+        }
+
+        self.stripe_get_invoice(invoice_id).await
+    }
+
+    async fn is_manual_lightning_invoice_settled(&self, bolt11: &str) -> Result<bool> {
+        let system_uri = Self::parse_nwc_uri(&self.nwc_url, "system")?;
+        let system_nwc = NWC::new(system_uri);
+
+        let lookup_req = LookupInvoiceRequest {
+            payment_hash: None,
+            invoice: Some(bolt11.to_string()),
+        };
+
+        let lookup_result = system_nwc.lookup_invoice(lookup_req).await;
+        system_nwc.shutdown().await;
+
+        let lookup_response =
+            lookup_result.map_err(|error| anyhow!("failed to lookup invoice: {error}"))?;
+
+        Ok(Self::lookup_invoice_response_is_settled(&lookup_response))
+    }
+
+    fn lookup_invoice_response_is_settled(response: &LookupInvoiceResponse) -> bool {
+        response.state == Some(TransactionState::Settled) || response.settled_at.is_some()
+    }
+
+    fn parse_nwc_uri(nwc_url: &str, role: &str) -> Result<NostrWalletConnectURI> {
+        nwc_url
+            .parse::<NostrWalletConnectURI>()
+            .map_err(|_| anyhow!("invalid {role} NWC URL"))
+    }
+
     async fn nwc_pay_invoice(
         &self,
+        invoice_id: &str,
+        tenant_pubkey: &str,
         amount_due_minor: i64,
         currency: &str,
         tenant_nwc_url: &str,
-    ) -> Result<()> {
-        let amount_msats = self.fiat_minor_to_msats(amount_due_minor, currency).await?;
+    ) -> Result<NwcInvoicePaymentOutcome> {
+        if let Some(existing_outcome) = self
+            .existing_invoice_nwc_payment_outcome(invoice_id)
+            .await?
+        {
+            return Ok(existing_outcome);
+        }
+
+        let amount_msats = match self.fiat_minor_to_msats(amount_due_minor, currency).await {
+            Ok(amount_msats) => amount_msats,
+            Err(error) => return Ok(NwcInvoicePaymentOutcome::Fallback(error)),
+        };
 
         // Create a bolt11 invoice using the system wallet (self.nwc_url)
-        let system_uri: NostrWalletConnectURI = self
-            .nwc_url
-            .parse()
-            .map_err(|_| anyhow!("invalid system NWC URL"))?;
+        let system_uri = match Self::parse_nwc_uri(&self.nwc_url, "system") {
+            Ok(system_uri) => system_uri,
+            Err(error) => return Ok(NwcInvoicePaymentOutcome::Fallback(error)),
+        };
         let system_nwc = NWC::new(system_uri);
 
         let make_req = MakeInvoiceRequest {
@@ -1021,29 +1292,61 @@ impl Billing {
             expiry: None,
         };
 
-        let invoice_response = system_nwc
-            .make_invoice(make_req)
-            .await
-            .map_err(|e| anyhow!("failed to create invoice: {e}"))?;
+        let invoice_response = system_nwc.make_invoice(make_req).await;
+
+        let invoice_response = match invoice_response {
+            Ok(invoice_response) => invoice_response,
+            Err(error) => {
+                system_nwc.shutdown().await;
+                return Ok(NwcInvoicePaymentOutcome::Fallback(anyhow!(
+                    "failed to create invoice: {error}"
+                )));
+            }
+        };
 
         system_nwc.shutdown().await;
 
         // Pay the bolt11 invoice using the tenant's wallet
-        let tenant_uri: NostrWalletConnectURI = tenant_nwc_url
-            .parse()
-            .map_err(|_| anyhow!("invalid tenant NWC URL"))?;
+        let tenant_uri = match Self::parse_nwc_uri(tenant_nwc_url, "tenant") {
+            Ok(tenant_uri) => tenant_uri,
+            Err(error) => return Ok(NwcInvoicePaymentOutcome::Fallback(error)),
+        };
+
+        if !self
+            .command
+            .insert_pending_invoice_nwc_payment(invoice_id, tenant_pubkey)
+            .await?
+        {
+            if let Some(existing_outcome) = self
+                .existing_invoice_nwc_payment_outcome(invoice_id)
+                .await?
+            {
+                return Ok(existing_outcome);
+            }
+            return Err(anyhow!(
+                "invoice_nwc_payment row missing after insert race for invoice {invoice_id}"
+            ));
+        }
+
         let tenant_nwc = NWC::new(tenant_uri);
 
         let pay_req = NwcPayInvoiceRequest::new(invoice_response.invoice);
 
-        tenant_nwc
-            .pay_invoice(pay_req)
-            .await
-            .map_err(|e| anyhow!("failed to pay invoice: {e}"))?;
+        let pay_result = tenant_nwc.pay_invoice(pay_req).await;
 
         tenant_nwc.shutdown().await;
 
-        Ok(())
+        match pay_result {
+            Ok(_) => match self.command.mark_invoice_nwc_payment_paid(invoice_id).await {
+                Ok(()) => Ok(NwcInvoicePaymentOutcome::Paid),
+                Err(error) => Ok(NwcInvoicePaymentOutcome::Pending(anyhow!(
+                    "invoice {invoice_id} was charged over NWC but failed to persist paid state: {error}"
+                ))),
+            },
+            Err(error) => Ok(NwcInvoicePaymentOutcome::Pending(anyhow!(
+                "invoice {invoice_id} NWC payment attempt requires reconciliation: {error}"
+            ))),
+        }
     }
 
     async fn fiat_minor_to_msats(&self, amount_due_minor: i64, currency: &str) -> Result<u64> {
@@ -1057,7 +1360,7 @@ impl Billing {
     }
 
     async fn fetch_btc_spot_price(&self, currency: &str) -> Result<f64> {
-        fetch_btc_spot_price_from_base(&self.http, &self.btc_quote_api_base, currency).await
+        fetch_btc_spot_price_from_base(&self.http, COINBASE_SPOT_API, currency).await
     }
 
     fn currency_minor_exponent(currency: &str) -> Result<u8> {
@@ -1101,6 +1404,31 @@ pub async fn fetch_btc_spot_price_from_base(
     Ok(amount)
 }
 
+fn summarize_nwc_error_for_dm(error: &str) -> Option<String> {
+    let normalized = error.split_whitespace().collect::<Vec<_>>().join(" ");
+    if normalized.is_empty() {
+        return None;
+    }
+
+    if normalized.chars().count() <= NWC_ERROR_DM_MAX_CHARS {
+        return Some(normalized);
+    }
+
+    let prefix_len = NWC_ERROR_DM_MAX_CHARS.saturating_sub(3);
+    let mut truncated = normalized.chars().take(prefix_len).collect::<String>();
+    truncated.push_str("...");
+    Some(truncated)
+}
+
+fn manual_lightning_payment_dm(nwc_error: Option<&str>) -> String {
+    match nwc_error {
+        Some(error) if !error.is_empty() => {
+            format!("{MANUAL_LIGHTNING_PAYMENT_DM}\n\n{NWC_ERROR_DM_PREFIX} {error}")
+        }
+        _ => MANUAL_LIGHTNING_PAYMENT_DM.to_string(),
+    }
+}
+
 pub fn fiat_minor_to_msats_from_quote(
     amount_due_minor: i64,
     currency: &str,
@@ -1399,3 +1727,4 @@ mod tests {
         assert_eq!(billing.stripe_webhook_secret, "whsec_test_dummy");
     }
 }
+

backend/src/command.rs

@@ -2,6 +2,7 @@ use anyhow::Result;
 use sqlx::{Sqlite, SqlitePool, Transaction};
 use tokio::sync::broadcast;
 
+use crate::crypto;
 use crate::models::{
     Activity, RELAY_STATUS_ACTIVE, RELAY_STATUS_DELINQUENT, RELAY_STATUS_INACTIVE, Relay, Tenant,
 };
@@ -70,6 +71,7 @@ impl Command {
             anyhow::bail!("stripe_customer_id is required");
         }
 
+        let encrypted_nwc_url = crypto::encrypt(&tenant.nwc_url)?;
         let mut tx = self.pool.begin().await?;
 
         sqlx::query(
@@ -77,7 +79,7 @@ impl Command {
              VALUES (?, ?, ?, ?)",
         )
         .bind(&tenant.pubkey)
-        .bind(&tenant.nwc_url)
+        .bind(&encrypted_nwc_url)
         .bind(tenant.created_at)
         .bind(&tenant.stripe_customer_id)
         .execute(&mut *tx)
@@ -92,10 +94,11 @@ impl Command {
     }
 
     pub async fn update_tenant(&self, tenant: &Tenant) -> Result<()> {
+        let encrypted_nwc_url = crypto::encrypt(&tenant.nwc_url)?;
         let mut tx = self.pool.begin().await?;
 
         sqlx::query("UPDATE tenant SET nwc_url = ? WHERE pubkey = ?")
-            .bind(&tenant.nwc_url)
+            .bind(&encrypted_nwc_url)
             .bind(&tenant.pubkey)
             .execute(&mut *tx)
             .await?;
@@ -113,12 +116,12 @@ impl Command {
 
         sqlx::query(
             "INSERT INTO relay (
-                id, tenant, schema, subdomain, plan, status, sync_error,
+                id, tenant, schema, subdomain, plan, status, synced, sync_error,
                 info_name, info_icon, info_description,
                 policy_public_join, policy_strip_signatures,
                 groups_enabled, management_enabled, blossom_enabled,
                 livekit_enabled, push_enabled
-            ) VALUES (?, ?, ?, ?, ?, 'active', ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
+            ) VALUES (?, ?, ?, ?, ?, 'active', 0, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
         )
         .bind(&relay.id)
         .bind(&relay.tenant)
@@ -151,7 +154,7 @@ impl Command {
 
         sqlx::query(
             "UPDATE relay
-             SET tenant = ?, schema = ?, subdomain = ?, plan = ?, status = ?, sync_error = ?,
+             SET tenant = ?, schema = ?, subdomain = ?, plan = ?, status = ?, sync_error = ?, synced = 0,
                  info_name = ?, info_icon = ?, info_description = ?,
                  policy_public_join = ?, policy_strip_signatures = ?,
                  groups_enabled = ?, management_enabled = ?, blossom_enabled = ?,
@@ -203,7 +206,7 @@ impl Command {
     ) -> Result<()> {
         let mut tx = self.pool.begin().await?;
 
-        sqlx::query("UPDATE relay SET status = ? WHERE id = ?")
+        sqlx::query("UPDATE relay SET status = ?, synced = 0 WHERE id = ?")
             .bind(status)
             .bind(relay_id)
             .execute(&mut *tx)
@@ -224,7 +227,7 @@ impl Command {
     pub async fn fail_relay_sync(&self, relay: &Relay, sync_error: String) -> Result<()> {
         let mut tx = self.pool.begin().await?;
 
-        sqlx::query("UPDATE relay SET sync_error = ? WHERE id = ?")
+        sqlx::query("UPDATE relay SET synced = 0, sync_error = ? WHERE id = ?")
             .bind(&sync_error)
             .bind(&relay.id)
             .execute(&mut *tx)
@@ -313,6 +316,70 @@ impl Command {
         Ok(())
     }
 
+    pub async fn insert_pending_invoice_nwc_payment(
+        &self,
+        invoice_id: &str,
+        tenant_pubkey: &str,
+    ) -> Result<bool> {
+        let now = chrono::Utc::now().timestamp();
+        let result = sqlx::query(
+            "INSERT INTO invoice_nwc_payment (invoice_id, tenant_pubkey, state, created_at, updated_at)
+             VALUES (?, ?, 'pending', ?, ?)
+             ON CONFLICT(invoice_id) DO NOTHING",
+        )
+        .bind(invoice_id)
+        .bind(tenant_pubkey)
+        .bind(now)
+        .bind(now)
+        .execute(&self.pool)
+        .await?;
+
+        Ok(result.rows_affected() > 0)
+    }
+
+    pub async fn mark_invoice_nwc_payment_paid(&self, invoice_id: &str) -> Result<()> {
+        let now = chrono::Utc::now().timestamp();
+        let result = sqlx::query(
+            "UPDATE invoice_nwc_payment
+             SET state = 'paid', updated_at = ?
+             WHERE invoice_id = ?",
+        )
+        .bind(now)
+        .bind(invoice_id)
+        .execute(&self.pool)
+        .await?;
+
+        if result.rows_affected() == 0 {
+            anyhow::bail!("invoice_nwc_payment row missing for invoice_id: {invoice_id}");
+        }
+
+        Ok(())
+    }
+
+    pub async fn insert_manual_lightning_invoice_payment(
+        &self,
+        invoice_id: &str,
+        tenant_pubkey: &str,
+        bolt11: &str,
+    ) -> Result<bool> {
+        let now = chrono::Utc::now().timestamp();
+        let result = sqlx::query(
+            "INSERT INTO invoice_manual_lightning_payment
+             (invoice_id, tenant_pubkey, bolt11, created_at, updated_at)
+             VALUES (?, ?, ?, ?, ?)
+             ON CONFLICT(invoice_id) DO NOTHING",
+        )
+        .bind(invoice_id)
+        .bind(tenant_pubkey)
+        .bind(bolt11)
+        .bind(now)
+        .bind(now)
+        .execute(&self.pool)
+        .await?;
+
+        Ok(result.rows_affected() > 0)
+    }
+
     pub async fn set_tenant_past_due(&self, pubkey: &str) -> Result<()> {
         let now = chrono::Utc::now().timestamp();
         sqlx::query("UPDATE tenant SET past_due_at = ? WHERE pubkey = ?")

backend/src/crypto.rs

@@ -0,0 +1,49 @@
+use anyhow::{Result, anyhow};
+use nostr_sdk::prelude::{Keys, nip44};
+
+const ENVELOPE_PREFIX: &str = "enc:nip44:v2:";
+
+pub fn encrypt(value: &str) -> Result<String> {
+    if value.is_empty() {
+        return Ok(String::new());
+    }
+
+    let keys = parse_encryption_keys()?;
+    let payload = nip44::encrypt(
+        keys.secret_key(),
+        &keys.public_key(),
+        value,
+        nip44::Version::V2,
+    )
+    .map_err(|e| anyhow!("encrypt failed: {e}"))?;
+
+    Ok(format!("{ENVELOPE_PREFIX}{payload}"))
+}
+
+pub fn decrypt(value: &str) -> Result<String> {
+    if value.is_empty() {
+        return Ok(String::new());
+    }
+
+    let Some(payload) = value.strip_prefix(ENVELOPE_PREFIX) else {
+        return Ok(value.to_string());
+    };
+
+    let keys = parse_encryption_keys()?;
+    nip44::decrypt(keys.secret_key(), &keys.public_key(), payload)
+        .map_err(|e| anyhow!("decrypt failed: {e}"))
+}
+
+fn parse_encryption_keys() -> Result<Keys> {
+    let raw = std::env::var("ENCRYPTION_SECRET")
+        .map_err(|_| anyhow!("missing ENCRYPTION_SECRET environment variable"))?;
+    let trimmed = raw.trim();
+
+    if trimmed.is_empty() {
+        return Err(anyhow!("missing ENCRYPTION_SECRET environment variable"));
+    }
+
+    Keys::parse(trimmed).map_err(|e| {
+        anyhow!("ENCRYPTION_SECRET must be a valid nostr secret key (hex or nsec): {e}")
+    })
+}

backend/src/infra.rs

@@ -1,10 +1,15 @@
 use anyhow::Result;
 use nostr_sdk::prelude::*;
+use std::time::Duration;
 
 use crate::command::Command;
 use crate::models::{Activity, RELAY_STATUS_DELINQUENT, RELAY_STATUS_INACTIVE, Relay};
 use crate::query::Query;
 
+const RELAY_SYNC_RETRY_BASE_DELAY_SECS: u64 = 30;
+const RELAY_SYNC_RETRY_MAX_DELAY_SECS: u64 = 15 * 60;
+const RELAY_SYNC_RETRY_MAX_ATTEMPTS: usize = 6;
+
 #[derive(Clone)]
 pub struct Infra {
     api_url: String,
@@ -48,6 +53,10 @@ impl Infra {
     pub async fn start(self) {
         let mut rx = self.command.notify.subscribe();
 
+        if let Err(error) = self.reconcile_relay_state("startup").await {
+            tracing::error!(error = %error, "failed to reconcile relay state on startup");
+        }
+
         loop {
             match rx.recv().await {
                 Ok(activity) => {
@@ -57,6 +66,10 @@ impl Infra {
                 }
                 Err(tokio::sync::broadcast::error::RecvError::Lagged(n)) => {
                     tracing::warn!(missed = n, "infra lagged");
+
+                    if let Err(error) = self.reconcile_relay_state("lagged").await {
+                        tracing::error!(error = %error, "failed to reconcile relay state after lag");
+                    }
                 }
                 Err(tokio::sync::broadcast::error::RecvError::Closed) => break,
             }
@@ -66,18 +79,111 @@ impl Infra {
     async fn handle_activity(&self, activity: &Activity) -> Result<()> {
         let needs_sync = should_sync_relay_activity(activity.activity_type.as_str());
 
-        if needs_sync {
-            let Some(relay) = self.query.get_relay(&activity.resource_id).await? else {
-                return Ok(());
-            };
+        if !needs_sync || activity.resource_type != "relay" {
+            return Ok(());
+        }
 
-            let is_new = relay.synced == 0;
-            self.sync_and_report(&relay, is_new).await;
+        if activity.activity_type == "fail_relay_sync" {
+            self.schedule_relay_sync_retry(&activity.resource_id, "activity")
+                .await?;
+            return Ok(());
+        }
+
+        let Some(relay) = self.query.get_relay(&activity.resource_id).await? else {
+            return Ok(());
+        };
+
+        let is_new = self.relay_sync_is_new(&relay).await?;
+        self.sync_and_report(&relay, is_new).await;
+
+        Ok(())
+    }
+
+    async fn reconcile_relay_state(&self, source: &str) -> Result<()> {
+        let relays = self.query.list_relays_pending_sync().await?;
+
+        if relays.is_empty() {
+            return Ok(());
+        }
+
+        tracing::info!(
+            source,
+            relay_count = relays.len(),
+            "reconciling pending relay state"
+        );
+
+        for relay in relays {
+            if relay.sync_error.trim().is_empty() {
+                let is_new = self.relay_sync_is_new(&relay).await?;
+                self.sync_and_report(&relay, is_new).await;
+            } else {
+                self.schedule_relay_sync_retry(&relay.id, source).await?;
+            }
         }
 
         Ok(())
     }
 
+    async fn schedule_relay_sync_retry(&self, relay_id: &str, source: &str) -> Result<()> {
+        let activities = self.query.list_activity_for_relay(relay_id).await?;
+        let consecutive_failures = consecutive_sync_failures(&activities);
+
+        let Some(delay) = relay_sync_retry_delay(consecutive_failures) else {
+            tracing::warn!(
+                relay = relay_id,
+                consecutive_failures,
+                max_attempts = RELAY_SYNC_RETRY_MAX_ATTEMPTS,
+                "relay sync retries exhausted; awaiting manual intervention"
+            );
+            return Ok(());
+        };
+
+        tracing::info!(
+            relay = relay_id,
+            source,
+            consecutive_failures,
+            delay_secs = delay.as_secs(),
+            "scheduled relay sync retry"
+        );
+
+        let relay_id = relay_id.to_string();
+        let infra = self.clone();
+
+        tokio::spawn(async move {
+            tokio::time::sleep(delay).await;
+
+            if let Err(e) = infra.retry_relay_sync(&relay_id).await {
+                tracing::error!(relay = %relay_id, error = %e, "relay sync retry task failed");
+            }
+        });
+
+        Ok(())
+    }
+
+    async fn retry_relay_sync(&self, relay_id: &str) -> Result<()> {
+        let Some(relay) = self.query.get_relay(relay_id).await? else {
+            return Ok(());
+        };
+
+        if relay.sync_error.trim().is_empty() {
+            tracing::debug!(relay = %relay.id, "skip relay sync retry; relay has no sync_error");
+            return Ok(());
+        }
+
+        let is_new = self.relay_sync_is_new(&relay).await?;
+        self.sync_and_report(&relay, is_new).await;
+        Ok(())
+    }
+
+    async fn relay_sync_is_new(&self, relay: &Relay) -> Result<bool> {
+        if relay.synced == 1 {
+            return Ok(false);
+        }
+
+        let has_completed_sync = self.query.relay_has_completed_sync(&relay.id).await?;
+        Ok(!has_completed_sync)
+    }
+
     async fn sync_and_report(&self, relay: &Relay, is_new: bool) {
         match self.sync_relay(relay, is_new).await {
             Ok(()) => {
@@ -258,6 +364,28 @@ fn relay_sync_body(
 fn should_sync_relay_activity(activity_type: &str) -> bool {
     matches!(
         activity_type,
-        "create_relay" | "update_relay" | "activate_relay" | "deactivate_relay"
+        "create_relay" | "update_relay" | "activate_relay" | "deactivate_relay" | "fail_relay_sync"
     )
 }
+
+fn consecutive_sync_failures(activities: &[Activity]) -> usize {
+    activities
+        .iter()
+        .take_while(|activity| activity.activity_type == "fail_relay_sync")
+        .count()
+}
+
+fn relay_sync_retry_delay(consecutive_failures: usize) -> Option<Duration> {
+    let retry_attempt = consecutive_failures.max(1);
+    if retry_attempt > RELAY_SYNC_RETRY_MAX_ATTEMPTS {
+        return None;
+    }
+
+    let exponent = (retry_attempt - 1).min(31);
+    let multiplier = 1u64 << exponent;
+    let delay_secs = RELAY_SYNC_RETRY_BASE_DELAY_SECS
+        .saturating_mul(multiplier)
+        .min(RELAY_SYNC_RETRY_MAX_DELAY_SECS);
+
+    Some(Duration::from_secs(delay_secs))
+}

backend/src/lib.rs

@@ -1,6 +1,7 @@
 pub mod api;
 pub mod billing;
 pub mod command;
+pub mod crypto;
 pub mod infra;
 pub mod models;
 pub mod pool;

backend/src/main.rs

@@ -1,6 +1,7 @@
 mod api;
 mod billing;
 mod command;
+mod crypto;
 mod infra;
 mod models;
 mod pool;

backend/src/query.rs

@@ -1,6 +1,7 @@
 use anyhow::Result;
 use sqlx::SqlitePool;
 
+use crate::crypto;
 use crate::models::{Activity, Plan, Relay, Tenant};
 
 #[derive(Clone)]
@@ -21,7 +22,7 @@ impl Query {
         )
         .fetch_all(&self.pool)
         .await?;
-        Ok(rows)
+        rows.into_iter().map(decrypt_tenant_nwc_url).collect()
     }
 
     pub async fn get_tenant(&self, pubkey: &str) -> Result<Option<Tenant>> {
@@ -33,7 +34,7 @@ impl Query {
         .bind(pubkey)
         .fetch_optional(&self.pool)
         .await?;
-        Ok(row)
+        row.map(decrypt_tenant_nwc_url).transpose()
     }
 
     pub fn list_plans() -> Vec<Plan> {
@@ -94,6 +95,23 @@ impl Query {
         Ok(rows)
     }
 
+    pub async fn list_relays_pending_sync(&self) -> Result<Vec<Relay>> {
+        let rows = sqlx::query_as::<_, Relay>(
+            "SELECT id, tenant, schema, subdomain, plan, stripe_subscription_item_id,
+                     status, sync_error,
+                     info_name, info_icon, info_description,
+                     policy_public_join, policy_strip_signatures,
+                     groups_enabled, management_enabled, blossom_enabled,
+                     livekit_enabled, push_enabled, synced
+              FROM relay
+              WHERE synced = 0 OR TRIM(sync_error) != ''
+              ORDER BY id",
+        )
+        .fetch_all(&self.pool)
+        .await?;
+        Ok(rows)
+    }
+
     pub async fn list_relays_for_tenant(&self, tenant_id: &str) -> Result<Vec<Relay>> {
         let rows = sqlx::query_as::<_, Relay>(
             "SELECT id, tenant, schema, subdomain, plan, stripe_subscription_item_id,
@@ -141,7 +159,30 @@ impl Query {
         .bind(stripe_customer_id)
         .fetch_optional(&self.pool)
         .await?;
-        Ok(row)
+        row.map(decrypt_tenant_nwc_url).transpose()
+    }
+
+    pub async fn get_invoice_nwc_payment_state(&self, invoice_id: &str) -> Result<Option<String>> {
+        let state = sqlx::query_scalar::<_, String>(
+            "SELECT state FROM invoice_nwc_payment WHERE invoice_id = ?",
+        )
+        .bind(invoice_id)
+        .fetch_optional(&self.pool)
+        .await?;
+        Ok(state)
+    }
+
+    pub async fn get_invoice_manual_lightning_bolt11(
+        &self,
+        invoice_id: &str,
+    ) -> Result<Option<String>> {
+        let bolt11 = sqlx::query_scalar::<_, String>(
+            "SELECT bolt11 FROM invoice_manual_lightning_payment WHERE invoice_id = ?",
+        )
+        .bind(invoice_id)
+        .fetch_optional(&self.pool)
+        .await?;
+        Ok(bolt11)
     }
 
     pub async fn has_active_paid_relays(&self, tenant_id: &str) -> Result<bool> {
@@ -167,4 +208,25 @@ impl Query {
         .await?;
         Ok(rows)
     }
+
+    pub async fn relay_has_completed_sync(&self, relay_id: &str) -> Result<bool> {
+        let found = sqlx::query_scalar::<_, i64>(
+            "SELECT 1
+             FROM activity
+             WHERE resource_type = 'relay'
+               AND resource_id = ?
+               AND activity_type = 'complete_relay_sync'
+             LIMIT 1",
+        )
+        .bind(relay_id)
+        .fetch_optional(&self.pool)
+        .await?;
+
+        Ok(found.is_some())
+    }
+}
+
+fn decrypt_tenant_nwc_url(mut tenant: Tenant) -> Result<Tenant> {
+    tenant.nwc_url = crypto::decrypt(&tenant.nwc_url)?;
+    Ok(tenant)
 }

frontend/src/lib/api.ts

@@ -99,6 +99,7 @@ export type UpdateRelayInput = {
 export type Tenant = {
   pubkey: string
   nwc_url: string
+  nwc_configured: boolean
   created_at: number
   stripe_customer_id: string
   stripe_subscription_id: string | null

frontend/src/lib/hooks.ts

@@ -135,7 +135,7 @@ export const reactivateRelayById = (id: string) => reactivateRelay(id)
 
 export async function tenantNeedsPaymentSetup(): Promise<boolean> {
   const tenant = await getTenant(account()!.pubkey)
-  return !tenant.nwc_url && !tenant.stripe_subscription_id
+  return !tenant.nwc_configured && !tenant.stripe_subscription_id
 }
 
 export async function getLatestOpenInvoice(): Promise<Invoice | null> {

frontend/src/pages/Account.tsx

@@ -18,9 +18,9 @@ export default function Account() {
   const invoicesLoading = useMinLoading(() => invoices.loading)
 
   const hasBillingChanges = createMemo(() => {
-    const current = tenant()?.nwc_url?.trim() ?? ""
     const next = nwcUrl().trim()
-    return current !== next
+    if (next) return true
+    return tenant()?.nwc_configured ?? false
   })
 
   createEffect(() => {
@@ -169,7 +169,7 @@ export default function Account() {
                               <p class="text-xs text-gray-500 mt-0.5">{periodLabel()}</p>
                             </Show>
                           </div>
-                          <div class="flex items-center gap-2 flex-shrink-0">
+                          <div class="flex items-center gap-2 shrink-0">
                             <Show when={isOpen()}>
                               <span class="text-xs text-blue-600 font-medium">Pay now</span>
                             </Show>

frontend/src/pages/relays/RelayDetail.tsx

@@ -52,7 +52,7 @@ export default function RelayDetail() {
     if (!isPaidRelay()) return false
     const t = tenant()
     if (!t) return false
-    return !t.nwc_url
+    return !t.nwc_configured
   })
 
   return (