diff --git a/client/src/lib.rs b/client/src/lib.rs
index a0d7160..65db2ff 100644
--- a/client/src/lib.rs
+++ b/client/src/lib.rs
@@ -28,7 +28,7 @@ mod tests {
 
         let mut session = Session::new(&host, None).await.unwrap();
         session
-            .auth_with_credentials(Uuid::from_str(&userid).unwrap(), "test".to_string())
+            .auth_with_credentials(Uuid::from_str(&userid).unwrap(), "test")
             .await
             .unwrap()
     }
diff --git a/client/src/session/data.rs b/client/src/session/data.rs
index ca7a3c8..e01c007 100644
--- a/client/src/session/data.rs
+++ b/client/src/session/data.rs
@@ -1,4 +1,4 @@
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Deserialize)]
 pub enum Permission {
@@ -14,12 +14,11 @@ pub mod api {
 
         pub mod auth {
             use super::*;
-            use serde::Serialize;
 
             #[derive(Debug, Serialize)]
-            pub struct Request {
-                pub userid: String,
-                pub password: String,
+            pub struct Request<'a> {
+                pub userid: &'a str,
+                pub password: &'a str,
             }
 
             #[derive(Debug, Deserialize)]
@@ -28,6 +27,21 @@ pub mod api {
             }
         }
 
+        pub mod register {
+            use super::*;
+
+            #[derive(Debug, Serialize)]
+            pub struct Request<'a> {
+                pub token: &'a str,
+                pub password: &'a str,
+            }
+
+            #[derive(Debug, Deserialize)]
+            pub struct Response {
+                pub userid: String,
+            }
+        }
+
         pub mod info {
             use super::*;
 
diff --git a/client/src/session/mod.rs b/client/src/session/mod.rs
index 5adf1b0..92e1814 100644
--- a/client/src/session/mod.rs
+++ b/client/src/session/mod.rs
@@ -103,13 +103,13 @@ impl Session {
     pub async fn auth_with_credentials(
         &mut self,
         userid: Uuid,
-        password: String,
+        password: &str,
     ) -> Result<(), Error> {
         let request = self
             .client
             .post(format!("{host}/account/auth", host = self.host))
             .json(&data::api::account::auth::Request {
-                userid: userid.to_string(),
+                userid: &userid.to_string(),
                 password,
             })
             .send();
@@ -123,4 +123,29 @@ impl Session {
 
         Ok(())
     }
+
+    /// Tries to register a new account on the server. If the server doesn't accept the invite-token,
+    /// this leads to an [crate::error::Error::InvalidToken] or [crate::error::Error::TokenExpired] error.
+    pub async fn register(&mut self, token: &str, password: &str) -> Result<(), Error> {
+        let request = self
+            .client
+            .post(format!("{host}/account/register", host = self.host))
+            .json(&data::api::account::register::Request {
+                token: &token,
+                password: &password,
+            })
+            .send();
+
+        let response =
+            parse_response::<data::api::account::register::Response>(request.await).await?;
+
+        self.auth_with_credentials(
+            Uuid::from_str(&response.userid)
+                .map_err(|_| Error::BadResponse("Failed to parse userid".to_string()))?,
+            password,
+        )
+        .await?;
+
+        Ok(())
+    }
 }