diff --git a/callbaker/__init__.py b/callbaker/__init__.py
index fdc9205..cf9ed3b 100644
--- a/callbaker/__init__.py
+++ b/callbaker/__init__.py
@@ -2,13 +2,23 @@
 This module contains all the necessary functions for
 creating callback data strings and parsing it from call's data.
 """
+from callbaker.constants import (
+    DEFAULT_MARK_VALUE,
+    DMV,
+    EMS,
+    EXTERNAL_MARK_SEPARATOR,
+    IMS,
+    INTERNAL_MARK_SEPARATOR,
+)
+from callbaker.functions import callback_from_info, info_from_callback
 
-EXTERNAL_MARK_SEPARATOR = "&"
-INTERNAL_MARK_SEPARATOR = "="
-DEFAULT_MARK_VALUE = "*"
-
-EMS = EXTERNAL_MARK_SEPARATOR
-IMS = INTERNAL_MARK_SEPARATOR
-DMV = DEFAULT_MARK_VALUE
-
-from callbaker.functions import info_from_callback, callback_from_info
+__all__ = [
+    "info_from_callback",
+    "callback_from_info",
+    "DEFAULT_MARK_VALUE",
+    "DMV",
+    "EXTERNAL_MARK_SEPARATOR",
+    "EMS",
+    "INTERNAL_MARK_SEPARATOR",
+    "IMS",
+]