diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/reject/ApSendRejectServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/reject/ApSendRejectServiceImpl.kt
new file mode 100644
index 00000000..383d1e38
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/reject/ApSendRejectServiceImpl.kt
@@ -0,0 +1,11 @@
+package dev.usbharu.hideout.activitypub.service.activity.reject
+
+import dev.usbharu.hideout.core.domain.model.user.User
+import org.springframework.stereotype.Service
+
+@Service
+class ApSendRejectServiceImpl : ApSendRejectService {
+    override suspend fun sendReject(user: User, target: User) {
+        TODO("Not yet implemented")
+    }
+}
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APSendUndoServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APSendUndoServiceImpl.kt
new file mode 100644
index 00000000..bd48ba1b
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APSendUndoServiceImpl.kt
@@ -0,0 +1,15 @@
+package dev.usbharu.hideout.activitypub.service.activity.undo
+
+import dev.usbharu.hideout.core.domain.model.user.User
+import org.springframework.stereotype.Service
+
+@Service
+class APSendUndoServiceImpl : APSendUndoService {
+    override suspend fun sendUndoFollow(user: User, target: User) {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun sendUndoBlock(user: User, target: User) {
+        TODO("Not yet implemented")
+    }
+}