diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5258faee4..8b751d8c1e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ the release.
 
 ## Unreleased
 
+* [checkout] Add app.payment.service.address span attribute to chargeCard for improved payment routing observability
+  ([#3203](https://github.com/open-telemetry/opentelemetry-demo/pull/3203))
 * [product-catalog] Enrich DB spans and metrics with `server.address` and `server.port`
   attributes extracted from the DSN via `otelsql.AttributesFromDSN`
   ([#3154](https://github.com/open-telemetry/opentelemetry-demo/pull/3154))
diff --git a/src/checkout/main.go b/src/checkout/main.go
index f014400c89..602cecad6d 100644
--- a/src/checkout/main.go
+++ b/src/checkout/main.go
@@ -543,11 +543,14 @@ func (cs *checkout) convertCurrency(ctx context.Context, from *pb.Money, toCurre
 
 func (cs *checkout) chargeCard(ctx context.Context, amount *pb.Money, paymentInfo *pb.CreditCardInfo) (string, error) {
 	paymentService := cs.paymentSvcClient
+	paymentAddr := cs.paymentSvcAddr
 	if cs.isFeatureFlagEnabled(ctx, "paymentUnreachable") {
-		badAddress := "badAddress:50051"
-		c := mustCreateClient(badAddress)
+		paymentAddr = "badAddress:50051"
+		c := mustCreateClient(paymentAddr)
 		paymentService = pb.NewPaymentServiceClient(c)
 	}
+	span := trace.SpanFromContext(ctx)
+	span.SetAttributes(attribute.String("app.payment.service.address", paymentAddr))
 
 	paymentResp, err := paymentService.Charge(ctx, &pb.ChargeRequest{
 		Amount:     amount,