diff --git a/option/subscription.go b/option/subscription.go
index b7c5a9b6..30765923 100644
--- a/option/subscription.go
+++ b/option/subscription.go
@@ -1,8 +1,9 @@
 package option
 
 type SubscriptionServiceOptions struct {
-	Interval  Duration                      `json:"interval,omitempty"`
-	Providers []SubscriptionProviderOptions `json:"providers"`
+	Interval       Duration                      `json:"interval,omitempty"`
+	DownloadDetour string                        `json:"download_detour,omitempty"`
+	Providers      []SubscriptionProviderOptions `json:"providers"`
 
 	DialerOptions
 }
diff --git a/service/default.go b/service/default.go
new file mode 100644
index 00000000..1868b229
--- /dev/null
+++ b/service/default.go
@@ -0,0 +1,21 @@
+package service
+
+import (
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/log"
+)
+
+type myServiceAdapter struct {
+	serviceType string
+	router      adapter.Router
+	logger      log.ContextLogger
+	tag         string
+}
+
+func (a *myServiceAdapter) Type() string {
+	return a.serviceType
+}
+
+func (a *myServiceAdapter) Tag() string {
+	return a.tag
+}
diff --git a/service/subscription.go b/service/subscription.go
index bfa2987e..8cb869af 100644
--- a/service/subscription.go
+++ b/service/subscription.go
@@ -2,10 +2,33 @@ package service
 
 import (
 	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
 )
 
-func NewSubscription(router adapter.Router, logger log.ContextLogger, options option.Service) (adapter.BoxService, error) {
-	panic("not implemented")
+var _ adapter.BoxService = (*Subscription)(nil)
+
+// Subscription is a service that subscribes to remote servers for outbounds.
+type Subscription struct {
+	myServiceAdapter
+}
+
+func NewSubscription(router adapter.Router, logger log.ContextLogger, options option.Service) (*Subscription, error) {
+	return &Subscription{
+		myServiceAdapter{
+			router:      router,
+			serviceType: C.ServiceSubscription,
+			logger:      logger,
+			tag:         options.Tag,
+		},
+	}, nil
+}
+
+func (s *Subscription) Start() error {
+	panic("implement me")
+}
+
+func (s *Subscription) Close() error {
+	panic("implement me")
 }