diff --git a/app.py b/app.py
index 75a08fb..98ba85d 100644
--- a/app.py
+++ b/app.py
@@ -22,6 +22,6 @@ Sending the SMS to any VMN should grant us access.
 
 """
 
-from fampay.constants import FamAppConsts
+from fampay.constants import FamAppConstants
 
-assert FamAppConsts.VERSION_CODE == "2602003"
+assert FamAppConstants.APP_VERSION_CODE == "2602003"
diff --git a/fampay/constants.py b/fampay/constants.py
index 86d4433..8eb6ec4 100644
--- a/fampay/constants.py
+++ b/fampay/constants.py
@@ -13,6 +13,14 @@ class _FamAppApiStore:
 
 
 @dataclass(frozen=True, slots=True)
-class FamAppConsts:
-    VERSION_CODE = "2602003"
+class FamAppConstants:
+    APP_VERSION_CODE = "2602003"  # FamBase.t
+    APP_VERSION_NAME = "26.2.3"  # FamBase.u
+    PLATFORM = "1"  # Android
+
+    # SHA-1 over the APK signing certificate DER (extracted from
+    # META-INF/BNDLTOOL.RSA of 26.2.3). Server pins this value.
+    APP_CERT_SHA1 = "43A2BD6824215BE3454B203BE7EC9E5A926BDDE7"
+    SIGNATURE_VERSION = "1"
+
     api = _FamAppApiStore()