diff --git a/lib/data_types.py b/lib/data_types.py
index c40fcc6..ceadfed 100644
--- a/lib/data_types.py
+++ b/lib/data_types.py
@@ -65,12 +65,12 @@ class ApiPayload(ABC):
 class AuthData:
     """data used to authenticate requester"""
 
-    endpoint: str
-    request_idx: int
-    url: str
-    cost: str
-    reqnum: int
     signature: str
+    cost: str
+    endpoint: str
+    reqnum: int
+    url: str
+    request_idx: int
 
     @classmethod
     def from_json_msg(cls, json_msg: Dict[str, Any]):