diff --git a/.env.example b/.env.example
index e8ca854..a2a3324 100644
--- a/.env.example
+++ b/.env.example
@@ -34,3 +34,10 @@ CRM_ENDPOINT=
 CRM_TOKEN=
 # MESBR
 MESBR_ENDPOINT=
+
+# Export pagination config, defaut 65530.
+CODE_PAGINATE=
+# Dictionnary of chars to use fo generating unique codes.
+CODE_CHAR_LIST=
+# Code length (chars).
+CODE_CHAR_LENGTH=
diff --git a/config/codes.php b/config/codes.php
index 3292f76..25bf7c7 100644
--- a/config/codes.php
+++ b/config/codes.php
@@ -5,7 +5,7 @@ return [
     'paginate' => env('CODE_PAGINATE', 65530),
 
     // Dictionnary of chars to use fo generating unique codes.
-    'codeCharList' => 'ABCDEFGHJKMNPQRSTUWXYZ123456789',
+    'codeCharList' => env('CODE_CHAR_LIST', 'ABCDEFGHJKMNPQRSTUWXYZ123456789'),
     // Code length.
-    'codeLength' => 8
+    'codeLength' => env('CODE_CHAR_LENGTH', 9)
 ];