diff --git a/uncloud/uncloud_pay/helpers.py b/uncloud/uncloud_pay/helpers.py
deleted file mode 100644
index 8daef2e..0000000
--- a/uncloud/uncloud_pay/helpers.py
+++ /dev/null
@@ -1,45 +0,0 @@
-import uuid
-
-from django.db import models
-from django.contrib.auth import get_user_model
-from django.utils.translation import gettext_lazy as _
-
-# See https://docs.djangoproject.com/en/dev/ref/models/fields/#field-choices-enum-types
-class RecurringPeriod(models.TextChoices):
-    ONE_TIME   = 'ONCE', _('Onetime')
-    PER_YEAR   = 'YEAR', _('Per Year')
-    PER_MONTH  = 'MONTH', _('Per Month')
-    PER_MINUTE = 'MINUTE', _('Per Minute')
-    PER_DAY    = 'DAY', _('Per Day')
-    PER_HOUR   = 'HOUR', _('Per Hour')
-    PER_SECOND = 'SECOND', _('Per Second')
-
-class Product(models.Model):
-    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
-    owner = models.ForeignKey(get_user_model(),
-                              on_delete=models.CASCADE,
-                              editable=False)
-
-    description = ""
-
-    status = models.CharField(max_length=256,
-                              choices = (
-                                  ('pending', 'Pending'),
-                                  ('being_created', 'Being created'),
-                                  ('active', 'Active'),
-                                  ('deleted', 'Deleted')
-                              ),
-                              default='pending'
-    )
-
-    order = models.ForeignKey('uncloud_pay.Order',
-                              on_delete=models.CASCADE,
-                              editable=False,
-                              null=True)
-
-    @property
-    def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):
-        pass # To be implemented in child.
-
-    class Meta:
-        abstract = True
diff --git a/uncloud/uncloud_pay/models.py b/uncloud/uncloud_pay/models.py
index 5f05b9d..c4506a2 100644
--- a/uncloud/uncloud_pay/models.py
+++ b/uncloud/uncloud_pay/models.py
@@ -1,15 +1,23 @@
-import uuid
-
 from django.db import models
 from django.contrib.auth import get_user_model
 from django.core.validators import MinValueValidator
+from django.utils.translation import gettext_lazy as _
 
-from .helpers import RecurringPeriod
-import uncloud_vm.models as vmmodels
+import uuid
 
 AMOUNT_MAX_DIGITS=10
 AMOUNT_DECIMALS=2
 
+# See https://docs.djangoproject.com/en/dev/ref/models/fields/#field-choices-enum-types
+class RecurringPeriod(models.TextChoices):
+    ONE_TIME   = 'ONCE', _('Onetime')
+    PER_YEAR   = 'YEAR', _('Per Year')
+    PER_MONTH  = 'MONTH', _('Per Month')
+    PER_MINUTE = 'MINUTE', _('Per Minute')
+    PER_DAY    = 'DAY', _('Per Day')
+    PER_HOUR   = 'HOUR', _('Per Hour')
+    PER_SECOND = 'SECOND', _('Per Second')
+
 class Bill(models.Model):
     owner = models.ForeignKey(get_user_model(),
             on_delete=models.CASCADE)
@@ -55,7 +63,8 @@ class Order(models.Model):
     @property
     def products(self):
         # Blows up due to circular dependency...
-        vms = vmmodels.VMProduct.objects.all() #filter(order=self)
+        # vms = VMProduct.objects.filter(order=self)
+        vms = []
         return vms
 
     # def amount(self):
@@ -107,3 +116,36 @@ class Payment(models.Model):
                               ),
                               default='unknown')
     timestamp = models.DateTimeField(editable=False)
+
+
+
+
+class Product(models.Model):
+    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    owner = models.ForeignKey(get_user_model(),
+                              on_delete=models.CASCADE,
+                              editable=False)
+
+    description = ""
+
+    status = models.CharField(max_length=256,
+                              choices = (
+                                  ('pending', 'Pending'),
+                                  ('being_created', 'Being created'),
+                                  ('active', 'Active'),
+                                  ('deleted', 'Deleted')
+                              ),
+                              default='pending'
+    )
+
+    order = models.ForeignKey(Order,
+                              on_delete=models.CASCADE,
+                              editable=False,
+                              null=True)
+
+    @property
+    def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):
+        pass # To be implemented in child.
+
+    class Meta:
+        abstract = True
diff --git a/uncloud/uncloud_pay/serializers.py b/uncloud/uncloud_pay/serializers.py
index 406b751..d08f9cf 100644
--- a/uncloud/uncloud_pay/serializers.py
+++ b/uncloud/uncloud_pay/serializers.py
@@ -23,7 +23,7 @@ class PaymentMethodSerializer(serializers.ModelSerializer):
         fields = ['owner', 'primary', 'source', 'description']
 
 class ProductSerializer(serializers.Serializer):
-    vms = VMProductSerializer(many=True, required=False, queryset=VMProduct.objects.all())
+    vms = VMProductSerializer(many=True, required=False)
 
     def create(self, validated_data):
         owner = validated_data.pop('owner')
@@ -31,7 +31,7 @@ class ProductSerializer(serializers.Serializer):
 
         vms = validated_data.pop('vms')
         for vm in vms:
-            print(VMProduct.objects.create(owner=owner, order=order, **vm))
+            VMProduct.objects.create(owner=owner, order=order, **vm)
 
         return True # FIXME: shoudl return created objects
 
diff --git a/uncloud/uncloud_vm/models.py b/uncloud/uncloud_vm/models.py
index 02ec20f..2db99f3 100644
--- a/uncloud/uncloud_vm/models.py
+++ b/uncloud/uncloud_vm/models.py
@@ -1,10 +1,9 @@
-import uuid
-
 from django.db import models
 from django.contrib.auth import get_user_model
+import uuid
 
-import uncloud_pay.models as paymodels
-import uncloud_pay.helpers as payhelpers
+from uncloud_pay.models import Product, RecurringPeriod
+import uncloud_pay.models as pay_models
 
 
 class VMHost(models.Model):
@@ -34,7 +33,7 @@ class VMHost(models.Model):
     )
 
 
-class VMProduct(payhelpers.Product):
+class VMProduct(Product):
     vmhost   = models.ForeignKey(VMHost,
                                  on_delete=models.CASCADE,
                                  editable=False,
@@ -46,8 +45,8 @@ class VMProduct(payhelpers.Product):
     ram_in_gb = models.FloatField()
 
     @property
-    def recurring_price(self, recurring_period=paymodels.RecurringPeriod.PER_MONTH):
-        if recurring_period == paymodels.RecurringPeriod.PER_MONTH:
+    def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):
+        if recurring_period == RecurringPeriod.PER_MONTH:
             # TODO: move magic numbers in variables
             return self.cores * 3 + self.ram_in_gb * 2
         else:
@@ -80,7 +79,7 @@ class VMNetworkCard(models.Model):
     mac_address = models.IntegerField()
 
 
-class VMSnapshotProduct(payhelpers.Product):
+class VMSnapshotProduct(Product):
     price_per_gb_ssd = 0.35
     price_per_gb_hdd = 1.5/100