invoices: expose AMPRecord() method on Payload

invoices/update.go

@@ -20,6 +20,7 @@ type invoiceUpdateCtx struct {
 	finalCltvRejectDelta int32
 	customRecords        record.CustomSet
 	mpp                  *record.MPP
+	amp                  *record.AMP
 }
 
 // invoiceRef returns an identifier that can be used to lookup or update the
@@ -34,8 +35,9 @@ func (i *invoiceUpdateCtx) invoiceRef() channeldb.InvoiceRef {
 
 // log logs a message specific to this update context.
 func (i *invoiceUpdateCtx) log(s string) {
-	log.Debugf("Invoice%v: %v, amt=%v, expiry=%v, circuit=%v, mpp=%v",
-		i.invoiceRef, s, i.amtPaid, i.expiry, i.circuitKey, i.mpp)
+	log.Debugf("Invoice%v: %v, amt=%v, expiry=%v, circuit=%v, mpp=%v, "+
+		"amp=%v", i.hash[:], s, i.amtPaid, i.expiry, i.circuitKey,
+		i.mpp, i.amp)
 }
 
 // failRes is a helper function which creates a failure resolution with