diff --git a/core/graphene/object_types.py b/core/graphene/object_types.py
index 75a4c964..ea9bad4e 100644
--- a/core/graphene/object_types.py
+++ b/core/graphene/object_types.py
@@ -1,5 +1,5 @@
 from django.core.cache import cache
-from django.db.models import Max, Min
+from django.db.models import Max, Min, QuerySet
 from django.db.models.functions import Length
 from django.utils.translation import gettext_lazy as _
 from graphene import (
@@ -336,20 +336,22 @@ class OrderType(DjangoObjectType):
         )
         description = _("orders")
 
-    def resolve_total_price(self, _info):
+    def resolve_total_price(self: Order, _info):
         return self.total_price
 
-    def resolve_total_quantity(self, _info):
+    def resolve_total_quantity(self: Order, _info):
         return self.total_quantity
 
-    def resolve_notifications(self, _info):
+    def resolve_notifications(self: Order, _info):
         return camelize(self.notifications)
 
-    def resolve_attributes(self, _info):
+    def resolve_attributes(self: Order, _info):
         return camelize(self.attributes)
 
-    def resolve_payments_transactions(self, _info) -> None | Transaction:
-        return None or self.payments_transactions
+    def resolve_payments_transactions(self: Order, _info) -> QuerySet[Transaction] | None:
+        if self.payments_transactions:
+            return self.payments_transactions.all()
+        return None
 
 
 class ProductImageType(DjangoObjectType):