diff --git a/src/principal/helpers.rs b/src/principal/helpers.rs
index 5fef54b..d3653d0 100644
--- a/src/principal/helpers.rs
+++ b/src/principal/helpers.rs
@@ -3,37 +3,244 @@ use crate::{
     core::{
         changes::{ChangesRequest, ChangesResponse},
         get::GetRequest,
-        query::{QueryRequest, QueryResponse},
+        query::{Comparator, Filter, QueryRequest, QueryResponse},
         query_changes::{QueryChangesRequest, QueryChangesResponse},
         request::{Arguments, Request},
         response::{PrincipalGetResponse, PrincipalSetResponse},
-        set::SetRequest,
+        set::{SetObject, SetRequest},
     },
     Get, Method, Set,
 };
 
-use super::Principal;
+use super::{Principal, Property, Type};
 
 impl Client {
     pub async fn individual_create(
         &mut self,
+        email: impl Into<String>,
+        secret: impl Into<String>,
         name: impl Into<String>,
-        parent_id: Option<impl Into<String>>,
     ) -> crate::Result<Principal> {
-        /*let mut request = self.build();
+        let mut request = self.build();
         let id = request
-            .set_mailbox()
+            .set_principal()
             .create()
             .name(name)
-            .role(role)
-            .parent_id(parent_id)
+            .secret(secret)
+            .email(email)
+            .ptype(Type::Individual)
             .create_id()
             .unwrap();
         request
-            .send_single::<MailboxSetResponse>()
+            .send_single::<PrincipalSetResponse>()
             .await?
-            .created(&id)*/
-        todo!()
+            .created(&id)
+    }
+
+    pub async fn domain_create(&mut self, name: impl Into<String>) -> crate::Result<Principal> {
+        let mut request = self.build();
+        let id = request
+            .set_principal()
+            .create()
+            .name(name)
+            .ptype(Type::Domain)
+            .create_id()
+            .unwrap();
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .created(&id)
+    }
+
+    pub async fn list_create(
+        &mut self,
+        email: impl Into<String>,
+        name: impl Into<String>,
+        members: impl IntoIterator<Item = impl Into<String>>,
+    ) -> crate::Result<Principal> {
+        let mut request = self.build();
+        let id = request
+            .set_principal()
+            .create()
+            .name(name)
+            .email(email)
+            .ptype(Type::List)
+            .members(members.into())
+            .create_id()
+            .unwrap();
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .created(&id)
+    }
+
+    pub async fn group_create(
+        &mut self,
+        email: impl Into<String>,
+        name: impl Into<String>,
+        members: impl IntoIterator<Item = impl Into<String>>,
+    ) -> crate::Result<Principal> {
+        let mut request = self.build();
+        let id = request
+            .set_principal()
+            .create()
+            .name(name)
+            .email(email)
+            .ptype(Type::Group)
+            .members(members.into())
+            .create_id()
+            .unwrap();
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .created(&id)
+    }
+
+    pub async fn principal_set_name(
+        &mut self,
+        id: &str,
+        name: impl Into<String>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        request.set_principal().update(id).name(name);
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .updated(id)
+    }
+
+    pub async fn principal_set_secret(
+        &mut self,
+        id: &str,
+        secret: impl Into<String>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        request.set_principal().update(id).secret(secret);
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .updated(id)
+    }
+
+    pub async fn principal_set_email(
+        &mut self,
+        id: &str,
+        email: impl Into<String>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        request.set_principal().update(id).email(email);
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .updated(id)
+    }
+
+    pub async fn principal_set_timezone(
+        &mut self,
+        id: &str,
+        timezone: Option<impl Into<String>>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        request.set_principal().update(id).timezone(timezone);
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .updated(id)
+    }
+
+    pub async fn principal_set_members(
+        &mut self,
+        id: &str,
+        members: Option<impl IntoIterator<Item = impl Into<String>>>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        request.set_principal().update(id).members(members);
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .updated(id)
+    }
+
+    pub async fn principal_set_aliases(
+        &mut self,
+        id: &str,
+        aliases: Option<impl IntoIterator<Item = impl Into<String>>>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        request.set_principal().update(id).aliases(aliases);
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .updated(id)
+    }
+
+    pub async fn principal_set_capabilities(
+        &mut self,
+        id: &str,
+        capabilities: Option<impl IntoIterator<Item = impl Into<String>>>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        request
+            .set_principal()
+            .update(id)
+            .capabilities(capabilities);
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .updated(id)
+    }
+
+    pub async fn principal_destroy(&mut self, id: &str) -> crate::Result<()> {
+        let mut request = self.build();
+        request.set_principal().destroy([id]).arguments();
+        request
+            .send_single::<PrincipalSetResponse>()
+            .await?
+            .destroyed(id)
+    }
+
+    pub async fn principal_get(
+        &mut self,
+        id: &str,
+        properties: Option<Vec<Property>>,
+    ) -> crate::Result<Option<Principal>> {
+        let mut request = self.build();
+        let get_request = request.get_principal().ids([id]);
+        if let Some(properties) = properties {
+            get_request.properties(properties.into_iter());
+        }
+        request
+            .send_single::<PrincipalGetResponse>()
+            .await
+            .map(|mut r| r.unwrap_list().pop())
+    }
+
+    pub async fn principal_query(
+        &mut self,
+        filter: Option<impl Into<Filter<super::query::Filter>>>,
+        sort: Option<impl IntoIterator<Item = Comparator<super::query::Comparator>>>,
+    ) -> crate::Result<QueryResponse> {
+        let mut request = self.build();
+        let query_request = request.query_principal();
+        if let Some(filter) = filter {
+            query_request.filter(filter);
+        }
+        if let Some(sort) = sort {
+            query_request.sort(sort.into_iter());
+        }
+        request.send_single::<QueryResponse>().await
+    }
+
+    pub async fn principal_changes(
+        &mut self,
+        since_state: impl Into<String>,
+        max_changes: usize,
+    ) -> crate::Result<ChangesResponse<Principal<Get>>> {
+        let mut request = self.build();
+        request
+            .changes_principal(since_state)
+            .max_changes(max_changes);
+        request.send_single().await
     }
 }
 
diff --git a/src/principal/set.rs b/src/principal/set.rs
index f84fe83..3e5f567 100644
--- a/src/principal/set.rs
+++ b/src/principal/set.rs
@@ -5,8 +5,8 @@ use crate::{core::set::SetObject, Get, Set};
 use super::{Principal, Type, ACL, DKIM};
 
 impl Principal<Set> {
-    pub fn name(&mut self, name: Option<impl Into<String>>) -> &mut Self {
-        self.name = name.map(|s| s.into());
+    pub fn name(&mut self, name: impl Into<String>) -> &mut Self {
+        self.name = name.into().into();
         self
     }
 
@@ -15,13 +15,13 @@ impl Principal<Set> {
         self
     }
 
-    pub fn email(&mut self, email: Option<impl Into<String>>) -> &mut Self {
-        self.email = email.map(|s| s.into());
+    pub fn email(&mut self, email: impl Into<String>) -> &mut Self {
+        self.email = email.into().into();
         self
     }
 
-    pub fn secret(&mut self, secret: Option<impl Into<String>>) -> &mut Self {
-        self.secret = secret.map(|s| s.into());
+    pub fn secret(&mut self, secret: impl Into<String>) -> &mut Self {
+        self.secret = secret.into().into();
         self
     }