Fix: Lightning Listener not listening on Lightning payment after activating when using lazy payments (#2524)

BTCPayServer/Events/InvoiceDataChangedEvent.cs

@@ -1,4 +1,4 @@
-using BTCPayServer.Services.Invoices;
+using BTCPayServer.Services.Invoices;
 
 namespace BTCPayServer.Events
 {

BTCPayServer/Events/InvoicePaymentMethodActivated.cs

@@ -0,0 +1,24 @@
+using BTCPayServer.Payments;
+using BTCPayServer.Services.Invoices;
+
+namespace BTCPayServer.Events
+{
+    public class InvoicePaymentMethodActivated : IHasInvoiceId
+    {
+        public PaymentMethodId PaymentMethodId { get; }
+        public InvoiceEntity InvoiceEntity { get; }
+
+        public InvoicePaymentMethodActivated(PaymentMethodId paymentMethodId, InvoiceEntity invoiceEntity)
+        {
+            PaymentMethodId = paymentMethodId;
+            InvoiceEntity = invoiceEntity;
+        }
+
+        public string InvoiceId  => InvoiceEntity.Id;
+
+        public override string ToString()
+        {
+            return $"Invoice {InvoiceId} activated payment method {PaymentMethodId}";
+        }
+    }
+}

BTCPayServer/Payments/Lightning/LightningListener.cs

@@ -168,6 +168,13 @@ namespace BTCPayServer.Payments.Lightning
                 }
                 
             }));
+            leases.Add(_Aggregator.Subscribe<Events.InvoicePaymentMethodActivated>(async inv =>
+            {
+                if (inv.PaymentMethodId.PaymentType == LightningPaymentType.Instance)
+                {
+                    _CheckInvoices.Writer.TryWrite(inv.InvoiceId);
+                }
+            }));
             _CheckingInvoice = CheckingInvoice(_Cts.Token);
             _ListenPoller = new Timer(async s =>
             {

BTCPayServer/Services/Invoices/InvoiceExtensions.cs

@@ -33,6 +33,7 @@ namespace BTCPayServer.Services.Invoices
                             prepare);
                     eligibleMethodToActivate.SetPaymentMethodDetails(newDetails);
                     await invoiceRepository.UpdateInvoicePaymentMethod(invoice.Id, eligibleMethodToActivate);
+                    eventAggregator.Publish(new InvoicePaymentMethodActivated(paymentMethodId, invoice));
                 }
                 catch (PaymentMethodUnavailableException ex)
                 {