diff --git a/Sources/ATProtoKit/APIReference/ComAtprotoAPI/GetServiceAuthentication.swift b/Sources/ATProtoKit/APIReference/ComAtprotoAPI/GetServiceAuthentication.swift
index cf9ae50e41..4e79dcca6f 100644
--- a/Sources/ATProtoKit/APIReference/ComAtprotoAPI/GetServiceAuthentication.swift
+++ b/Sources/ATProtoKit/APIReference/ComAtprotoAPI/GetServiceAuthentication.swift
@@ -18,12 +18,20 @@ extension ATProtoKit {
     ///
     /// [github]: https://github.com/bluesky-social/atproto/blob/main/lexicons/com/atproto/server/getServiceAuth.json
     ///
-    /// - Parameter serviceDID: The decentralized identifier (DID) of the service.
+    /// - Parameters:
+    ///   -  serviceDID: The decentralized identifier (DID) of the service.
+    ///   - expirationTime: The exporation date of the session tokens expire. Optional.
+    ///   Defaults to 60 seconds in the Unix Epoch format.
+    ///   - lexiconMethod: The Namespaced Identifier (NSID) of the lexicon that the token is bound to. Optional.
     /// - Returns: The signed token from the service that matches `serviceDID`.
     ///
     /// - Throws: An ``ATProtoError``-conforming error type, depending on the issue. Go to
     /// ``ATAPIError`` and ``ATRequestPrepareError`` for more details.
-    public func getServiceAuthentication(from serviceDID: String) async throws -> ComAtprotoLexicon.Server.GetServiceAuthOutput {
+    public func getServiceAuthentication(
+        from serviceDID: String,
+        expirationTime: Int? = 60,
+        lexiconMethod: String?
+    ) async throws -> ComAtprotoLexicon.Server.GetServiceAuthOutput {
         guard session != nil,
               let accessToken = session?.accessToken else {
             throw ATRequestPrepareError.missingActiveSession
@@ -34,10 +42,18 @@ extension ATProtoKit {
             throw ATRequestPrepareError.invalidRequestURL
         }
 
-        let queryItems = [
+        var queryItems = [
             ("aud", serviceDID)
         ]
 
+        if let expirationTime {
+            queryItems.append(("exp", "\(expirationTime)"))
+        }
+
+        if let lexiconMethod {
+            queryItems.append(("lxm", lexiconMethod))
+        }
+
         let queryURL: URL
 
         do {
diff --git a/Sources/ATProtoKit/Errors/ATProtoError.swift b/Sources/ATProtoKit/Errors/ATProtoError.swift
index a0b617d6a8..ede9899eb3 100644
--- a/Sources/ATProtoKit/Errors/ATProtoError.swift
+++ b/Sources/ATProtoKit/Errors/ATProtoError.swift
@@ -106,7 +106,8 @@ public enum ATAPIError: ATProtoError, Decodable {
                 "AuthFactorTokenRequired",
                 "MemberAlreadyExists",
                 "MemberNotFound",
-                "CannotDeleteSelf":
+                "CannotDeleteSelf",
+                "BadExpiration":
                 self = .badRequest(message: message)
             case "Unauthorized":
                 self = .unauthorized(message: message)
diff --git a/Sources/ATProtoKit/Models/Lexicons/app.bsky/Feed/AppBskyFeedDefs.swift b/Sources/ATProtoKit/Models/Lexicons/app.bsky/Feed/AppBskyFeedDefs.swift
index 6880572ec2..6c217fe5b1 100644
--- a/Sources/ATProtoKit/Models/Lexicons/app.bsky/Feed/AppBskyFeedDefs.swift
+++ b/Sources/ATProtoKit/Models/Lexicons/app.bsky/Feed/AppBskyFeedDefs.swift
@@ -601,7 +601,7 @@ extension AppBskyLexicon.Feed {
         /// The feed generator's context. Optional.
         ///
         /// - Note: According to the AT Protocol specifications: "Context on a feed item that was
-        /// orginally supplied by the feed generator on getFeedSkeleton."
+        /// originally supplied by the feed generator on getFeedSkeleton."
         public let feedContext: String?
 
         public init(item: String, event: Event, feedContext: String) {
diff --git a/Sources/ATProtoKit/Models/Lexicons/com.atproto/Label/ComAtprotoLabelDefs.swift b/Sources/ATProtoKit/Models/Lexicons/com.atproto/Label/ComAtprotoLabelDefs.swift
index bb512aa2e6..779b0aaea0 100644
--- a/Sources/ATProtoKit/Models/Lexicons/com.atproto/Label/ComAtprotoLabelDefs.swift
+++ b/Sources/ATProtoKit/Models/Lexicons/com.atproto/Label/ComAtprotoLabelDefs.swift
@@ -210,7 +210,7 @@ extension ComAtprotoLexicon.Label {
     /// A definition model for labeler-created labels.
     ///
     /// - Note: According to the AT Protocol specifications: "Declares a label value and its expected
-    /// interpertations and behaviors."
+    /// interpretations and behaviors."
     ///
     /// - SeeAlso: This is based on the [`com.atproto.label.defs`][github] lexicon.
     ///