diff --git a/src/core/set.rs b/src/core/set.rs
index 739387f..fc2f683 100644
--- a/src/core/set.rs
+++ b/src/core/set.rs
@@ -234,6 +234,10 @@ impl<O: SetObject> SetResponse<O> {
         self.new_state.as_deref()
     }
 
+    pub fn unwrap_new_state(&mut self) -> Option<String> {
+        self.new_state.take()
+    }
+
     pub fn created(&mut self, id: &str) -> crate::Result<O> {
         if let Some(result) = self.created.as_mut().and_then(|r| r.remove(id)) {
             Ok(result)
@@ -291,6 +295,18 @@ impl<O: SetObject> SetResponse<O> {
     pub fn not_destroyed_ids(&self) -> Option<impl Iterator<Item = &String>> {
         self.not_destroyed.as_ref().map(|map| map.keys())
     }
+
+    pub fn has_updated(&self) -> bool {
+        self.updated.as_ref().map_or(false, |m| !m.is_empty())
+    }
+
+    pub fn has_created(&self) -> bool {
+        self.created.as_ref().map_or(false, |m| !m.is_empty())
+    }
+
+    pub fn has_destroyed(&self) -> bool {
+        self.destroyed.as_ref().map_or(false, |m| !m.is_empty())
+    }
 }
 
 impl<U: Display> SetError<U> {
diff --git a/src/email/get.rs b/src/email/get.rs
index a8ec751..8ce7e6c 100644
--- a/src/email/get.rs
+++ b/src/email/get.rs
@@ -11,7 +11,7 @@ impl Email<Get> {
     }
 
     pub fn unwrap_id(self) -> String {
-        self.id.unwrap()
+        self.id.unwrap_or_default()
     }
 
     pub fn blob_id(&self) -> Option<&str> {
diff --git a/src/email_submission/get.rs b/src/email_submission/get.rs
index 85fbbb6..59141b3 100644
--- a/src/email_submission/get.rs
+++ b/src/email_submission/get.rs
@@ -10,7 +10,7 @@ impl EmailSubmission<Get> {
     }
 
     pub fn unwrap_id(self) -> String {
-        self.id.unwrap()
+        self.id.unwrap_or_default()
     }
 
     pub fn identity_id(&self) -> Option<&str> {
diff --git a/src/identity/get.rs b/src/identity/get.rs
index c436e71..bd400c1 100644
--- a/src/identity/get.rs
+++ b/src/identity/get.rs
@@ -8,7 +8,7 @@ impl Identity<Get> {
     }
 
     pub fn unwrap_id(self) -> String {
-        self.id.unwrap()
+        self.id.unwrap_or_default()
     }
 
     pub fn name(&self) -> Option<&str> {
diff --git a/src/mailbox/get.rs b/src/mailbox/get.rs
index 92a9d47..cbeeb4f 100644
--- a/src/mailbox/get.rs
+++ b/src/mailbox/get.rs
@@ -10,7 +10,7 @@ impl Mailbox<Get> {
     }
 
     pub fn unwrap_id(self) -> String {
-        self.id.unwrap()
+        self.id.unwrap_or_default()
     }
 
     pub fn name(&self) -> Option<&str> {
diff --git a/src/mailbox/helpers.rs b/src/mailbox/helpers.rs
index f81d1fb..478b8ca 100644
--- a/src/mailbox/helpers.rs
+++ b/src/mailbox/helpers.rs
@@ -103,6 +103,22 @@ impl Client {
             .updated(id)
     }
 
+    pub async fn mailbox_subscribe(
+        &self,
+        id: &str,
+        is_subscribed: bool,
+    ) -> crate::Result<Option<Mailbox>> {
+        let mut request = self.build();
+        request
+            .set_mailbox()
+            .update(id)
+            .is_subscribed(is_subscribed);
+        request
+            .send_single::<MailboxSetResponse>()
+            .await?
+            .updated(id)
+    }
+
     pub async fn mailbox_destroy(&self, id: &str, delete_emails: bool) -> crate::Result<()> {
         let mut request = self.build();
         request
diff --git a/src/mailbox/set.rs b/src/mailbox/set.rs
index f8f58d7..60791e5 100644
--- a/src/mailbox/set.rs
+++ b/src/mailbox/set.rs
@@ -34,6 +34,11 @@ impl Mailbox<Set> {
         self
     }
 
+    pub fn is_subscribed(&mut self, is_subscribed: bool) -> &mut Self {
+        self.is_subscribed = is_subscribed.into();
+        self
+    }
+
     pub fn acls<T, U, V>(&mut self, acls: T) -> &mut Self
     where
         T: IntoIterator<Item = (U, V)>,
diff --git a/src/principal/get.rs b/src/principal/get.rs
index a86eb1f..5f151ba 100644
--- a/src/principal/get.rs
+++ b/src/principal/get.rs
@@ -10,7 +10,7 @@ impl Principal<Get> {
     }
 
     pub fn unwrap_id(self) -> String {
-        self.id.unwrap()
+        self.id.unwrap_or_default()
     }
 
     pub fn ptype(&self) -> Option<&Type> {
diff --git a/src/push_subscription/get.rs b/src/push_subscription/get.rs
index e29047d..dfd0de2 100644
--- a/src/push_subscription/get.rs
+++ b/src/push_subscription/get.rs
@@ -8,7 +8,7 @@ impl PushSubscription<Get> {
     }
 
     pub fn unwrap_id(self) -> String {
-        self.id.unwrap()
+        self.id.unwrap_or_default()
     }
 
     pub fn device_client_id(&self) -> Option<&str> {