Last bit of major changes

Closes #1
Closes #5
Closes #6
Closes #8
Closes #9
Closes #10

users/tests/test_payment.py

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+from django.test import TestCase
+from users.models import PaymentMethod, User
+from store.utils import Encryptor
+
+class PaymentEncryptionTest(TestCase):
+    def test_encryption_decryption(self):
+        user = User.objects.create_user(username='testuser', password='password')
+        pm = PaymentMethod(user=user, brand='Visa', exp_month=12, exp_year=2030)
+        
+        # Test setter
+        pm.card_number = '1234567890123456'
+        pm.cvv = '123'
+        
+        # Verify it's encrypted
+        self.assertIsNotNone(pm.card_number_encrypted)
+        self.assertNotEqual(pm.card_number_encrypted, b'1234567890123456')
+        
+        # Verify getter
+        self.assertEqual(pm.card_number, '1234567890123456')
+        self.assertEqual(pm.cvv, '123')
+        
+        # Save and retrieval
+        pm.save()
+        
+        pm_fetched = PaymentMethod.objects.get(id=pm.id)
+        self.assertEqual(pm_fetched.card_number, '1234567890123456')
+        self.assertEqual(pm_fetched.cvv, '123')
+        self.assertEqual(pm_fetched.last4, '3456')