diff --git a/src/account.rs b/src/account.rs
index b6a94716..83e01ad9 100644
--- a/src/account.rs
+++ b/src/account.rs
@@ -5,11 +5,12 @@ use openssl::pkey::{PKey, Private};
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
 
+use crate::authorization::{Authorization, GetAuthorization};
 use crate::b64u;
 use crate::directory::Directory;
 use crate::jws::Jws;
 use crate::key::PublicKey;
-use crate::order::{NewOrder, OrderData};
+use crate::order::{NewOrder, Order, OrderData};
 use crate::request::Request;
 use crate::Error;
 
@@ -117,6 +118,31 @@ impl Account {
         })
     }
 
+    /// Prepare a JSON POST request.
+    fn post_request_raw_payload(
+        &self,
+        url: &str,
+        nonce: &str,
+        payload: String,
+    ) -> Result<Request, Error> {
+        let key = PKey::private_key_from_pem(self.private_key.as_bytes())?;
+        let body = serde_json::to_string(&Jws::new_full(
+            &key,
+            Some(self.location.clone()),
+            url.to_owned(),
+            nonce.to_owned(),
+            payload,
+        )?)?;
+
+        Ok(Request {
+            url: url.to_owned(),
+            method: "POST",
+            content_type: crate::request::JSON_CONTENT_TYPE,
+            body,
+            expected: 200,
+        })
+    }
+
     /// Get the "key authorization" for a token.
     pub fn key_authorization(&self, token: &str) -> Result<String, Error> {
         let key = PKey::private_key_from_pem(self.private_key.as_bytes())?;
@@ -131,6 +157,67 @@ impl Account {
         let digest = openssl::sha::sha256(key_authorization.as_bytes());
         Ok(b64u::encode(&digest))
     }
+
+    /// Prepare a request to update account data.
+    ///
+    /// This is a rather low level interface. You should know what you're doing.
+    pub fn update_account_request<T: Serialize>(
+        &self,
+        nonce: &str,
+        data: &T,
+    ) -> Result<Request, Error> {
+        self.post_request(&self.location, nonce, data)
+    }
+
+    /// Prepare a request to deactivate this account.
+    ///
+    /// This is a rather low level interface. You should know what you're doing.
+    pub fn deactivate_account_request<T: Serialize>(&self, nonce: &str) -> Result<Request, Error> {
+        self.post_request_raw_payload(
+            &self.location,
+            nonce,
+            r#"{"status":"deactivated"}"#.to_string(),
+        )
+    }
+
+    /// Prepare a request to query an Authorization for an Order.
+    ///
+    /// Returns `Ok(None)` if `auth_index` is out of out of range. You can query the number of
+    /// authorizations from via [`Order::authorization_len`] or by manually inspecting its
+    /// `.data.authorization` vector.
+    pub fn get_authorization(
+        &self,
+        order: &Order,
+        auth_index: usize,
+        nonce: &str,
+    ) -> Result<Option<GetAuthorization>, Error> {
+        match order.authorization(auth_index) {
+            None => Ok(None),
+            Some(url) => Ok(Some(GetAuthorization::new(self.get_request(url, nonce)?))),
+        }
+    }
+
+    /// Prepare a request to validate a Challenge from an Authorization.
+    ///
+    /// Returns `Ok(None)` if `challenge_index` is out of out of range. You can query the number of
+    /// challenges from via [`Authorization::challenge_len`] or by manually inspecting its
+    /// `.challenges` vector.
+    ///
+    /// This returns a raw `Request` since validation takes some time and the `Authorization`
+    /// object has to be re-queried and its `status` inspected.
+    pub fn validate_challenge(
+        &self,
+        authorization: &Authorization,
+        challenge_index: usize,
+        nonce: &str,
+    ) -> Result<Option<Request>, Error> {
+        match authorization.challenges.get(challenge_index) {
+            None => Ok(None),
+            Some(challenge) => self
+                .post_request_raw_payload(&challenge.url, nonce, "{}".to_string())
+                .map(Some),
+        }
+    }
 }
 
 #[derive(Clone, Copy, Eq, PartialEq, Deserialize, Serialize)]
diff --git a/src/authorization.rs b/src/authorization.rs
index 051306f4..f42a4cca 100644
--- a/src/authorization.rs
+++ b/src/authorization.rs
@@ -4,6 +4,8 @@ use serde::{Deserialize, Serialize};
 use serde_json::Value;
 
 use crate::order::Identifier;
+use crate::request::Request;
+use crate::Error;
 
 #[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
 #[serde(rename_all = "lowercase")]
@@ -32,12 +34,25 @@ pub struct Authorization {
     pub wildcard: bool,
 }
 
+#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
+#[serde(rename_all = "lowercase")]
+pub enum ChallengeStatus {
+    Pending,
+    Processing,
+    Valid,
+    Invalid,
+}
+
 #[derive(Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Challenge {
     #[serde(rename = "type")]
     pub ty: String,
 
+    pub status: ChallengeStatus,
+
+    pub url: String,
+
     #[serde(flatten)]
     pub data: HashMap<String, Value>,
 }
@@ -55,3 +70,24 @@ impl Challenge {
 fn is_false(b: &bool) -> bool {
     !*b
 }
+
+/// Represents an in-flight query for an authorization.
+///
+/// This is created via [`Account::get_authorization`].
+pub struct GetAuthorization {
+    //order: OrderData,
+    pub request: Option<Request>,
+}
+
+impl GetAuthorization {
+    pub(crate) fn new(request: Request) -> Self {
+        Self {
+            request: Some(request),
+        }
+    }
+
+    /// Deal with the response we got from the server.
+    pub fn response(self, response_body: &[u8]) -> Result<Authorization, Error> {
+        Ok(serde_json::from_slice(response_body)?)
+    }
+}
diff --git a/src/order.rs b/src/order.rs
index fd6fb865..3576b96e 100644
--- a/src/order.rs
+++ b/src/order.rs
@@ -100,6 +100,18 @@ pub struct Order {
     pub data: OrderData,
 }
 
+impl Order {
+    /// Get an authorization URL (or `None` if the index is out of range).
+    pub fn authorization(&self, index: usize) -> Option<&str> {
+        Some(&self.data.authorizations.get(index)?)
+    }
+
+    /// Get the number of authorizations in this object.
+    pub fn authorization_len(&self) -> usize {
+        self.data.authorizations.len()
+    }
+}
+
 /// Represents a new in-flight order creation.
 ///
 /// This is created via [`Account::new_order`].