diff --git a/core/serializers/detail.py b/core/serializers/detail.py
index 1869140b..217a29fa 100644
--- a/core/serializers/detail.py
+++ b/core/serializers/detail.py
@@ -1,7 +1,5 @@
 import logging
-from collections.abc import Collection
 from contextlib import suppress
-from typing import Any
 
 from django.contrib.auth.models import AnonymousUser
 from django.core.cache import cache
@@ -115,21 +113,14 @@ class CategoryDetailSerializer(ModelSerializer):
 
         return filterable_results
 
-    def get_children(self, obj) -> Collection[Any]:
+    def get_children(self, obj) -> list:
         request = self.context.get("request")
         if request is not None and request.user.has_perm("view_category"):
             children = obj.children.all()
         else:
             children = obj.children.filter(is_active=True)
 
-        if obj.children.exists():
-            return (
-                CategoryDetailSerializer(children, many=True, context=self.context).data
-                if obj.children.exists()
-                else []
-            )
-        else:
-            return []
+        return CategoryDetailSerializer(children, many=True, context=self.context).data if obj.children.exists() else []
 
 
 class BrandDetailSerializer(ModelSerializer):
diff --git a/core/serializers/simple.py b/core/serializers/simple.py
index f05e1a75..6f9e01ce 100644
--- a/core/serializers/simple.py
+++ b/core/serializers/simple.py
@@ -1,4 +1,3 @@
-from collections.abc import Collection
 from contextlib import suppress
 
 from rest_framework.fields import JSONField, SerializerMethodField
@@ -59,21 +58,14 @@ class CategorySimpleSerializer(ModelSerializer):
             return obj.image.url
         return None
 
-    def get_children(self, obj) -> Collection:
+    def get_children(self, obj) -> list:
         request = self.context.get("request")
         if request is not None and request.user.has_perm("view_category"):
             children = obj.children.all()
         else:
             children = obj.children.filter(is_active=True)
 
-        if obj.children.exists():
-            return (
-                CategorySimpleSerializer(children, many=True, context=self.context).data
-                if obj.children.exists()
-                else []
-            )
-        else:
-            return []
+        return CategorySimpleSerializer(children, many=True, context=self.context).data if obj.children.exists() else []
 
 
 class BrandSimpleSerializer(ModelSerializer):
diff --git a/payments/serializers.py b/payments/serializers.py
index 47f953a0..c3191e8f 100644
--- a/payments/serializers.py
+++ b/payments/serializers.py
@@ -19,11 +19,11 @@ class TransactionProcessSerializer(ModelSerializer):
     order_hr_id = SerializerMethodField(read_only=True, required=False)
     order_uuid = SerializerMethodField(read_only=True, required=False)
 
-    def get_order_hr_id(self, obj: Transaction):
+    def get_order_hr_id(self, obj: Transaction) -> str | None:
         return obj.order.human_readable_id if obj.order else None  # type: ignore
 
-    def get_order_uuid(self, obj: Transaction):
-        return obj.order.uuid if obj.order else None  # type: ignore
+    def get_order_uuid(self, obj: Transaction) -> str | None:
+        return str(obj.order.uuid) if obj.order else None  # type: ignore
 
     class Meta:
         model = Transaction
diff --git a/vibes_auth/locale/ru_RU/LC_MESSAGES/django.mo b/vibes_auth/locale/ru_RU/LC_MESSAGES/django.mo
index fb02b957..be0f617f 100644
Binary files a/vibes_auth/locale/ru_RU/LC_MESSAGES/django.mo and b/vibes_auth/locale/ru_RU/LC_MESSAGES/django.mo differ
diff --git a/vibes_auth/locale/ru_RU/LC_MESSAGES/django.po b/vibes_auth/locale/ru_RU/LC_MESSAGES/django.po
index 31fa2c4e..04c9b86e 100644
--- a/vibes_auth/locale/ru_RU/LC_MESSAGES/django.po
+++ b/vibes_auth/locale/ru_RU/LC_MESSAGES/django.po
@@ -282,7 +282,7 @@ msgstr "Токен в черном списке"
 
 #: vibes_auth/models.py:131
 msgid "blacklisted tokens"
-msgstr "Токены, внесенные в черный список"
+msgstr "Чёрный список токенов"
 
 #: vibes_auth/serializers.py:110 vibes_auth/serializers.py:132
 msgid "no active account"