diff --git a/uncloud/uncloud_pay/__init__.py b/uncloud/uncloud_pay/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/uncloud/uncloud_pay/admin.py b/uncloud/uncloud_pay/admin.py
new file mode 100644
index 0000000..8c38f3f
--- /dev/null
+++ b/uncloud/uncloud_pay/admin.py
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+from django.contrib import admin
+
+# Register your models here.
diff --git a/uncloud/uncloud_pay/apps.py b/uncloud/uncloud_pay/apps.py
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index 0000000..051ffb4
--- /dev/null
+++ b/uncloud/uncloud_pay/apps.py
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+from django.apps import AppConfig
+
+
+class UncloudPayConfig(AppConfig):
+    name = 'uncloud_pay'
diff --git a/uncloud/uncloud_pay/migrations/__init__.py b/uncloud/uncloud_pay/migrations/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/uncloud/uncloud_pay/models.py b/uncloud/uncloud_pay/models.py
new file mode 100644
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+++ b/uncloud/uncloud_pay/models.py
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+from django.db import models
+from django.contrib.auth import get_user_model
+
+# Create your models here.
+
+
+class Bill(models.Model):
+    owner = models.ForeignKey(get_user_model(),
+            on_delete=models.CASCADE,
+            editable=False)
+
+    creation_date = models.DateTimeField()
+    starting_date = models.DateTimeField()
+    ending_date = models.DateTimeField()
+    due_date = models.DateField()
+
+    paid = models.BooleanField(default=False)
+    valid = models.BooleanField(default=True)
+
+    @property
+    def amount(self):
+        # iterate over all related orders
+        pass
+
+
+class Order(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)
+
+    creation_date = models.DateTimeField()
+    starting_date = models.DateTimeField()
+    ending_date = models.DateTimeField(blank=True,
+                                       null=True)
+
+    bill = models.ManyToManyField(Bill,
+                                  on_delete=models.CASCADE,
+                                  editable=False,
+                                  blank=True,
+                                  null=True)
+
+
+    recurring_price = models.FloatField(editable=False)
+    one_time_price = models.FloatField(editable=False)
+
+    recurring_period = models.CharField(max_length=32,
+                              choices = (
+                                  ('onetime', 'Onetime'),
+                                  ('per_year', 'Per Year'),
+                                  ('per_month', 'Per Month'),
+                                  ('per_week', 'Per Week'),
+                                  ('per_day', 'Per Day'),
+                                  ('per_hour', 'Per Hour'),
+                                  ('per_minute', 'Per Minute'),
+                                  ('per_second', 'Per Second'),
+                              ),
+                              default='onetime'
+
+    )
+
+    # def amount(self):
+    #     amount = recurring_price
+    #     if recurring and first_month:
+    #         amount += one_time_price
+
+    #     return amount # you get the picture
+
+
+
+class Payment(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)
+
+    amount = models.DecimalField(
+            default=0.0,
+            validators=[MinValueValidator(0)])
+
+    source = models.CharField(max_length=256,
+                              choices = (
+                                  ('wire', 'Wire Transfer'),
+                                  ('strip', 'Stripe'),
+                                  ('voucher', 'Voucher'),
+                                  ('referral', 'Referral'),
+                                  ('unknown', 'Unknown')
+                              ),
+                              default='unknown')
+    timestamp = models.DateTimeField(editable=False)
diff --git a/uncloud/uncloud_pay/tests.py b/uncloud/uncloud_pay/tests.py
new file mode 100644
index 0000000..7ce503c
--- /dev/null
+++ b/uncloud/uncloud_pay/tests.py
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+from django.test import TestCase
+
+# Create your tests here.
diff --git a/uncloud/uncloud_pay/views.py b/uncloud/uncloud_pay/views.py
new file mode 100644
index 0000000..b52a2b6
--- /dev/null
+++ b/uncloud/uncloud_pay/views.py
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+from django.shortcuts import render
+
+# Create your views here.
+
+
+# to be implemented
+class BalanceViewSet(viewsets.ModelViewSet):
+    # here we return a number
+    # number = sum(payments) - sum(bills)
+
+    bills = Bills.objects.filter(owner=self.request.user)
+    payments = Payment.objects.filter(owner=self.request.user)
+
+    # sum_paid = sum([ amount for amount payments..,.  ]) # you get the picture
+    # sum_to_be_paid = sum([ amount for amount bills..,.  ]) # you get the picture
+
+
+class Bills(viewset.ModelViewSet):
+    def unpaid(self, request):
+        return Bills.objects.filter(owner=self.request.user, paid=False)
+
+
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+
+    serializer_class = BillSerializer
+    permission_classes = [permissions.IsAuthenticated]
+    http_method_names = ['get']
+
+    def get_queryset(self):
+        return self.request.user.get_bills()