diff --git a/passageidentity/passage.py b/passageidentity/passage.py
index 5501458..d59a734 100644
--- a/passageidentity/passage.py
+++ b/passageidentity/passage.py
@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 from passageidentity.auth import Auth
-from passageidentity.errors import PassageError
 from passageidentity.user import User
 
 
@@ -13,16 +12,17 @@ class Passage:
     COOKIE_AUTH = 1
     HEADER_AUTH = 2
 
-    def __init__(self, app_id: str, api_key: str = "", auth_strategy: int = COOKIE_AUTH) -> None:
+    def __init__(self, app_id: str, api_key: str) -> None:
         """Initialize a new Passage instance."""
         if not app_id:
-            msg = "A Passage app ID is required. Please include {app_id=YOUR_APP_ID, api_key=YOUR_API_KEY}."
-            raise PassageError(msg)
+            msg = "A Passage app ID is required. Please include (app_id=YOUR_APP_ID, api_key=YOUR_API_KEY)."
+            raise ValueError(msg)
 
-        self.app_id: str = app_id
-        self.passage_apikey: str = api_key
-        self.auth_strategy: int = auth_strategy
-        self.request_headers = {"Authorization": f"Bearer {api_key}"}
+        if not api_key:
+            msg = "A Passage API key is required. Please include (app_id=YOUR_APP_ID, api_key=YOUR_API_KEY)."
+            raise ValueError(msg)
 
-        self.auth = Auth(app_id, self.request_headers)
-        self.user = User(app_id, self.request_headers)
+        request_headers = {"Authorization": f"Bearer {api_key}"}
+
+        self.auth = Auth(app_id, request_headers)
+        self.user = User(app_id, request_headers)