Add initial structure for payment methods

uncloud/uncloud_pay/models.py

@@ -68,7 +68,22 @@ class Order(models.Model):
 
     #     return amount # you get the picture
 
+class PaymentMethod(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)
+    source = models.CharField(max_length=256,
+            choices = (
+                ('stripe', 'Stripe'),
+                ('unknown', 'Unknown'),
+                ),
+            default='stripe')
+    description = models.TextField()
+    primary = models.BooleanField(default=True)
 
+    class Meta:
+        unique_together = [['owner', 'primary']]
 
 class Payment(models.Model):
     uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)