diff --git a/payments/serializers.py b/payments/serializers.py
index 71230481..db34beb1 100644
--- a/payments/serializers.py
+++ b/payments/serializers.py
@@ -28,4 +28,4 @@ class TransactionProcessSerializer(ModelSerializer):
     class Meta:
         model = Transaction
         fields = ("process", "order_hr_id", "order_uuid")
-        readonly_fields = ("process", "order_hr_id", "order_uuid")
+        read_only_fields = ("process", "order_hr_id", "order_uuid")