Added usd field to payment object (#227)

Test by running `tox`.

Ticket: TPT-1878

Author: ezilber-akamai-zz

linode_api4/objects/account.py

@@ -224,7 +224,7 @@ class Payment(Base):
     properties = {
         "id": Property(identifier=True),
         "date": Property(is_datetime=True),
-        "amount": Property(),
+        "usd": Property(),
     }
 
 

test/fixtures/account_payments.json

@@ -0,0 +1,13 @@
+{
+    "data": [
+      {
+        "id": 123456,
+        "date": "2015-01-01T05:01:02",
+        "usd": 1000
+      }
+    ],
+    "page": 1,
+    "pages": 1,
+    "results": 1
+  }
+  

test/linode_client_test.py

@@ -239,6 +239,19 @@ def test_get_invoices(self):
         self.assertEqual(invoice.label, 'Invoice #123456')
         self.assertEqual(invoice.total, 9.51)
 
+    def test_payments(self):
+        """
+        Tests that payments can be retrieved
+        """
+        p = self.client.account.payments()
+
+        self.assertEqual(len(p), 1)
+        payment = p[0]
+
+        self.assertEqual(payment.id, 123456)
+        self.assertEqual(payment.date, datetime(2015, 1, 1, 5, 1, 2))
+        self.assertEqual(payment.usd, 1000)
+
 
 class LinodeGroupTest(ClientBaseCase):
     """