Merge pull request #7378 from edx/clintonb/pay-with-oscar

Creating orders with E-Commerce API

lms/djangoapps/commerce/api.py

+""" E-Commerce API client """
+
+import json
+import logging
+
+from django.conf import settings
+import jwt
+import requests
+from requests import Timeout
+from rest_framework.status import HTTP_200_OK
+
+from commerce.exceptions import InvalidResponseError, TimeoutError, InvalidConfigurationError
+
+
+log = logging.getLogger(__name__)
+
+
+class EcommerceAPI(object):
+    """ E-Commerce API client. """
+
+    def __init__(self, url=None, key=None, timeout=None):
+        self.url = url or settings.ECOMMERCE_API_URL
+        self.key = key or settings.ECOMMERCE_API_SIGNING_KEY
+        self.timeout = timeout or getattr(settings, 'ECOMMERCE_API_TIMEOUT', 5)
+
+        if not (self.url and self.key):
+            raise InvalidConfigurationError('Values for both url and key must be set.')
+
+        # Remove slashes, so that we can properly format URLs regardless of
+        # whether the input includes a trailing slash.
+        self.url = self.url.strip('/')
+
+    def _get_jwt(self, user):
+        """
+        Returns a JWT object with the specified user's info.
+
+        Raises AttributeError if settings.ECOMMERCE_API_SIGNING_KEY is not set.
+        """
+        data = {
+            'username': user.username,
+            'email': user.email
+        }
+        return jwt.encode(data, self.key)
+
+    def create_order(self, user, sku):
+        """
+        Create a new order.
+
+        Arguments
+            user    --  User for which the order should be created.
+            sku     --  SKU of the course seat being ordered.
+
+        Returns a tuple with the order number, order status, API response data.
+        """
+        headers = {
+            'Content-Type': 'application/json',
+            'Authorization': 'JWT {}'.format(self._get_jwt(user))
+        }
+
+        url = '{}/orders/'.format(self.url)
+
+        try:
+            response = requests.post(url, data=json.dumps({'sku': sku}), headers=headers, timeout=self.timeout)
+            data = response.json()
+        except Timeout:
+            msg = 'E-Commerce API request timed out.'
+            log.error(msg)
+            raise TimeoutError(msg)
+
+        except ValueError:
+            msg = 'E-Commerce API response is not valid JSON.'
+            log.exception(msg)
+            raise InvalidResponseError(msg)
+
+        status_code = response.status_code
+
+        if status_code == HTTP_200_OK:
+            return data['number'], data['status'], data
+        else:
+            msg = u'Response from E-Commerce API was invalid: (%(status)d) - %(msg)s'
+            msg_kwargs = {
+                'status': status_code,
+                'msg': data.get('user_message'),
+            }
+            log.error(msg, msg_kwargs)
+            raise InvalidResponseError(msg % msg_kwargs)

lms/djangoapps/commerce/exceptions.py

+""" E-Commerce-related exceptions. """
+
+
+class ApiError(Exception):
+    """ Base class for E-Commerce API errors. """
+    pass
+
+
+class InvalidConfigurationError(ApiError):
+    """ Exception raised when the API is not properly configured (e.g. settings are not set). """
+    pass
+
+
+class InvalidResponseError(ApiError):
+    """ Exception raised when an API response is invalid. """
+    pass
+
+
+class TimeoutError(ApiError):
+    """ Exception raised when an API requests times out. """
+    pass

lms/djangoapps/commerce/tests/__init__.py

+""" Commerce app tests package. """
+import json
+
+import httpretty
+import jwt
+import mock
+
+from commerce.api import EcommerceAPI
+from commerce.constants import OrderStatus
+
+
+class EcommerceApiTestMixin(object):
+    """ Mixin for tests utilizing the E-Commerce API. """
+
+    ECOMMERCE_API_URL = 'http://example.com/api'
+    ECOMMERCE_API_SIGNING_KEY = 'edx'
+    ORDER_NUMBER = '100004'
+    ECOMMERCE_API_SUCCESSFUL_BODY = {
+        'status': OrderStatus.COMPLETE,
+        'number': ORDER_NUMBER,
+        'payment_processor': 'cybersource',
+        'payment_parameters': {'orderNumber': ORDER_NUMBER}
+    }
+    ECOMMERCE_API_SUCCESSFUL_BODY_JSON = json.dumps(ECOMMERCE_API_SUCCESSFUL_BODY)  # pylint: disable=invalid-name
+
+    def assertValidJWTAuthHeader(self, request, user, key):
+        """ Verifies that the JWT Authorization header is correct. """
+        expected_jwt = jwt.encode({'username': user.username, 'email': user.email}, key)
+        self.assertEqual(request.headers['Authorization'], 'JWT {}'.format(expected_jwt))
+
+    def assertValidOrderRequest(self, request, user, jwt_signing_key, sku):
+        """ Verifies that an order request to the E-Commerce Service is valid. """
+        self.assertValidJWTAuthHeader(request, user, jwt_signing_key)
+
+        self.assertEqual(request.body, '{{"sku": "{}"}}'.format(sku))
+        self.assertEqual(request.headers['Content-Type'], 'application/json')
+
+    def _mock_ecommerce_api(self, status=200, body=None):
+        """
+        Mock calls to the E-Commerce API.
+
+        The calling test should be decorated with @httpretty.activate.
+        """
+        self.assertTrue(httpretty.is_enabled(), 'Test is missing @httpretty.activate decorator.')
+
+        url = self.ECOMMERCE_API_URL + '/orders/'
+        body = body or self.ECOMMERCE_API_SUCCESSFUL_BODY_JSON
+        httpretty.register_uri(httpretty.POST, url, status=status, body=body)
+
+    class mock_create_order(object):    # pylint: disable=invalid-name
+        """ Mocks calls to EcommerceAPI.create_order. """
+
+        patch = None
+
+        def __init__(self, **kwargs):
+            default_kwargs = {
+                'return_value': (
+                    EcommerceApiTestMixin.ORDER_NUMBER,
+                    OrderStatus.COMPLETE,
+                    EcommerceApiTestMixin.ECOMMERCE_API_SUCCESSFUL_BODY
+                )
+            }
+
+            default_kwargs.update(kwargs)
+
+            self.patch = mock.patch.object(EcommerceAPI, 'create_order', mock.Mock(**default_kwargs))
+
+        def __enter__(self):
+            self.patch.start()
+            return self.patch.new
+
+        def __exit__(self, exc_type, exc_val, exc_tb):  # pylint: disable=unused-argument
+            self.patch.stop()

lms/djangoapps/commerce/tests/test_api.py

+""" Tests the E-Commerce API module. """
+
+import json
+
+from ddt import ddt, data
+from django.core.urlresolvers import reverse
+from django.test.testcases import TestCase
+from django.test.utils import override_settings
+import httpretty
+from requests import Timeout
+
+from commerce.api import EcommerceAPI
+from commerce.constants import OrderStatus
+from commerce.exceptions import InvalidResponseError, TimeoutError, InvalidConfigurationError
+from commerce.tests import EcommerceApiTestMixin
+from student.tests.factories import UserFactory
+
+
+@ddt
+@override_settings(ECOMMERCE_API_URL=EcommerceApiTestMixin.ECOMMERCE_API_URL,
+                   ECOMMERCE_API_SIGNING_KEY=EcommerceApiTestMixin.ECOMMERCE_API_SIGNING_KEY)
+class EcommerceAPITests(EcommerceApiTestMixin, TestCase):
+    """ Tests for the E-Commerce API client. """
+
+    SKU = '1234'
+
+    def setUp(self):
+        super(EcommerceAPITests, self).setUp()
+        self.url = reverse('commerce:orders')
+        self.user = UserFactory()
+        self.api = EcommerceAPI()
+
+    def test_constructor_url_strip(self):
+        """ Verifies that the URL is stored with trailing slashes removed. """
+        url = 'http://example.com'
+        api = EcommerceAPI(url, 'edx')
+        self.assertEqual(api.url, url)
+
+        api = EcommerceAPI(url + '/', 'edx')
+        self.assertEqual(api.url, url)
+
+    @override_settings(ECOMMERCE_API_URL=None, ECOMMERCE_API_SIGNING_KEY=None)
+    def test_no_settings(self):
+        """
+        If the settings ECOMMERCE_API_URL and ECOMMERCE_API_SIGNING_KEY are invalid, the constructor should
+        raise a ValueError.
+        """
+        self.assertRaises(InvalidConfigurationError, EcommerceAPI)
+
+    @httpretty.activate
+    def test_create_order(self):
+        """ Verify the method makes a call to the E-Commerce API with the correct headers and data. """
+        self._mock_ecommerce_api()
+        number, status, body = self.api.create_order(self.user, self.SKU)
+
+        # Validate the request sent to the E-Commerce API endpoint.
+        request = httpretty.last_request()
+        self.assertValidOrderRequest(request, self.user, self.ECOMMERCE_API_SIGNING_KEY, self.SKU)
+
+        # Validate the data returned by the method
+        self.assertEqual(number, self.ORDER_NUMBER)
+        self.assertEqual(status, OrderStatus.COMPLETE)
+        self.assertEqual(body, self.ECOMMERCE_API_SUCCESSFUL_BODY)
+
+    @httpretty.activate
+    @data(400, 401, 405, 406, 429, 500, 503)
+    def test_create_order_with_invalid_http_status(self, status):
+        """ If the E-Commerce API returns a non-200 status, the method should raise an InvalidResponseError. """
+        self._mock_ecommerce_api(status=status, body=json.dumps({'user_message': 'FAIL!'}))
+        self.assertRaises(InvalidResponseError, self.api.create_order, self.user, self.SKU)
+
+    @httpretty.activate
+    def test_create_order_with_invalid_json(self):
+        """ If the E-Commerce API returns un-parseable data, the method should raise an InvalidResponseError. """
+        self._mock_ecommerce_api(body='TOTALLY NOT JSON!')
+        self.assertRaises(InvalidResponseError, self.api.create_order, self.user, self.SKU)
+
+    @httpretty.activate
+    def test_create_order_with_timeout(self):
+        """ If the call to the E-Commerce API times out, the method should raise a TimeoutError. """
+
+        def request_callback(_request, _uri, _headers):
+            """ Simulates API timeout """
+            raise Timeout
+
+        self._mock_ecommerce_api(body=request_callback)
+
+        self.assertRaises(TimeoutError, self.api.create_order, self.user, self.SKU)

lms/djangoapps/commerce/views.py

 """ Commerce views. """
-import json
 import logging
-from simplejson import JSONDecodeError
 
-from django.conf import settings
-import jwt
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey
-import requests
 from rest_framework.permissions import IsAuthenticated
-from rest_framework.status import HTTP_406_NOT_ACCEPTABLE, HTTP_202_ACCEPTED, HTTP_200_OK, HTTP_409_CONFLICT
+from rest_framework.status import HTTP_406_NOT_ACCEPTABLE, HTTP_202_ACCEPTED, HTTP_409_CONFLICT
 from rest_framework.views import APIView
 
+from commerce.api import EcommerceAPI
 from commerce.constants import OrderStatus, Messages
+from commerce.exceptions import ApiError, InvalidConfigurationError
 from commerce.http import DetailResponse, ApiErrorResponse
 from course_modes.models import CourseMode
 from courseware import courses
@@ -55,17 +52,6 @@ class OrdersView(APIView):
 
         return True, course_key, None
 
-    def _get_jwt(self, user, ecommerce_api_signing_key):
-        """
-        Returns a JWT object with the specified user's info.
-
-        """
-        data = {
-            'username': user.username,
-            'email': user.email
-        }
-        return jwt.encode(data, ecommerce_api_signing_key)
-
     def _enroll(self, course_key, user):
         """ Enroll the user in the course. """
         add_enrollment(user.username, unicode(course_key))
@@ -79,23 +65,17 @@ class OrdersView(APIView):
         if not valid:
             return DetailResponse(error, status=HTTP_406_NOT_ACCEPTABLE)
 
-        # Ensure that the E-Commerce API is setup properly
-        ecommerce_api_url = getattr(settings, 'ECOMMERCE_API_URL', None)
-        ecommerce_api_signing_key = getattr(settings, 'ECOMMERCE_API_SIGNING_KEY', None)
-        course_id = unicode(course_key)
-
         # Don't do anything if an enrollment already exists
+        course_id = unicode(course_key)
         enrollment = CourseEnrollment.get_enrollment(user, course_key)
         if enrollment and enrollment.is_active:
             msg = Messages.ENROLLMENT_EXISTS.format(course_id=course_id, username=user.username)
             return DetailResponse(msg, status=HTTP_409_CONFLICT)
 
-        # Ensure that the course has an honor mode with SKU
-        honor_mode = CourseMode.mode_for_course(course_key, CourseMode.HONOR)
-        course_id = unicode(course_key)
-
         # If there is no honor course mode, this most likely a Prof-Ed course. Return an error so that the JS
         # redirects to track selection.
+        honor_mode = CourseMode.mode_for_course(course_key, CourseMode.HONOR)
+
         if not honor_mode:
             msg = Messages.NO_HONOR_MODE.format(course_id=course_id)
             return DetailResponse(msg, status=HTTP_406_NOT_ACCEPTABLE)
@@ -107,40 +87,18 @@ class OrdersView(APIView):
             self._enroll(course_key, user)
             return DetailResponse(msg)
 
-        # If the API is not configured, bypass it.
-        if not (ecommerce_api_url and ecommerce_api_signing_key):
+        # Setup the API and report any errors if settings are not valid.
+        try:
+            api = EcommerceAPI()
+        except InvalidConfigurationError:
             self._enroll(course_key, user)
-            msg = Messages.NO_ECOM_API.format(username=user.username, course_id=course_id)
+            msg = Messages.NO_ECOM_API.format(username=user.username, course_id=unicode(course_key))
             log.debug(msg)
             return DetailResponse(msg)
 
-        # Contact external API
-        headers = {
-            'Content-Type': 'application/json',
-            'Authorization': 'JWT {}'.format(self._get_jwt(user, ecommerce_api_signing_key))
-        }
-
-        url = '{}/orders/'.format(ecommerce_api_url.strip('/'))
-
+        # Make the API call
         try:
-            timeout = getattr(settings, 'ECOMMERCE_API_TIMEOUT', 5)
-            response = requests.post(url, data=json.dumps({'sku': honor_mode.sku}), headers=headers,
-                                     timeout=timeout)
-        except Exception as ex:  # pylint: disable=broad-except
-            log.exception('Call to E-Commerce API failed: %s.', ex.message)
-            return ApiErrorResponse()
-
-        status_code = response.status_code
-
-        try:
-            data = response.json()
-        except JSONDecodeError:
-            log.error('E-Commerce API response is not valid JSON.')
-            return ApiErrorResponse()
-
-        if status_code == HTTP_200_OK:
-            order_number = data.get('number')
-            order_status = data.get('status')
+            order_number, order_status, _body = api.create_order(user, honor_mode.sku)
             if order_status == OrderStatus.COMPLETE:
                 msg = Messages.ORDER_COMPLETED.format(order_number=order_number)
                 log.debug(msg)
@@ -162,12 +120,6 @@ class OrdersView(APIView):
 
                 msg = Messages.ORDER_INCOMPLETE_ENROLLED.format(order_number=order_number)
                 return DetailResponse(msg, status=HTTP_202_ACCEPTED)
-        else:
-            msg = u'Response from E-Commerce API was invalid: (%(status)d) - %(msg)s'
-            msg_kwargs = {
-                'status': status_code,
-                'msg': data.get('user_message'),
-            }
-            log.error(msg, msg_kwargs)
-
+        except ApiError:
+            # The API will handle logging of the error.
             return ApiErrorResponse()

lms/djangoapps/verify_student/tests/test_views.py

@@ -3,12 +3,14 @@
 Tests of verify_student views.
 """
 import json
-import mock
 import urllib
-from mock import patch, Mock
-import pytz
 from datetime import timedelta, datetime
+from uuid import uuid4
 
+from django.test.utils import override_settings
+import mock
+from mock import patch, Mock
+import pytz
 import ddt
 from django.test.client import Client
 from django.test import TestCase
@@ -17,14 +19,16 @@ from django.core.urlresolvers import reverse
 from django.core.exceptions import ObjectDoesNotExist
 from django.core import mail
 from bs4 import BeautifulSoup
-
-from openedx.core.djangoapps.user_api.accounts.api import get_account_settings
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
 from xmodule.modulestore.django import modulestore
 from xmodule.modulestore import ModuleStoreEnum
 from opaque_keys.edx.locations import SlashSeparatedCourseKey
 from opaque_keys.edx.locator import CourseLocator
+
+from openedx.core.djangoapps.user_api.accounts.api import get_account_settings
+from commerce.exceptions import ApiError
+from commerce.tests import EcommerceApiTestMixin
 from student.tests.factories import UserFactory, CourseEnrollmentFactory
 from student.models import CourseEnrollment
 from course_modes.tests.factories import CourseModeFactory
@@ -839,7 +843,7 @@ class TestPayAndVerifyView(UrlResetMixin, ModuleStoreTestCase):
         self.assertEqual(response_dict['course_name'], mode_display_name)
 
 
-class TestCreateOrder(ModuleStoreTestCase):
+class TestCreateOrder(EcommerceApiTestMixin, ModuleStoreTestCase):
     """
     Tests for the create order view.
     """
@@ -850,20 +854,27 @@ class TestCreateOrder(ModuleStoreTestCase):
         self.user = UserFactory.create(username="test", password="test")
         self.course = CourseFactory.create()
         for mode, min_price in (('audit', 0), ('honor', 0), ('verified', 100)):
-            CourseModeFactory(mode_slug=mode, course_id=self.course.id, min_price=min_price)
+            # Set SKU to empty string to ensure view knows how to handle such values
+            CourseModeFactory(mode_slug=mode, course_id=self.course.id, min_price=min_price, sku='')
         self.client.login(username="test", password="test")
 
+    def _post(self, data):
+        """
+        POST to the view being tested and return the response.
+        """
+        url = reverse('verify_student_create_order')
+        return self.client.post(url, data)
+
     def test_create_order_already_verified(self):
         # Verify the student so we don't need to submit photos
         self._verify_student()
 
         # Create an order
-        url = reverse('verify_student_create_order')
         params = {
             'course_id': unicode(self.course.id),
             'contribution': 100
         }
-        response = self.client.post(url, params)
+        response = self._post(params)
         self.assertEqual(response.status_code, 200)
 
         # Verify that the information will be sent to the correct callback URL
@@ -884,11 +895,8 @@ class TestCreateOrder(ModuleStoreTestCase):
         CourseModeFactory(mode_slug="professional", course_id=course.id, min_price=10)
 
         # Create an order for a prof ed course
-        url = reverse('verify_student_create_order')
-        params = {
-            'course_id': unicode(course.id)
-        }
-        response = self.client.post(url, params)
+        params = {'course_id': unicode(course.id)}
+        response = self._post(params)
         self.assertEqual(response.status_code, 200)
 
         # Verify that the course ID and transaction type are included in "merchant-defined data"
@@ -903,11 +911,8 @@ class TestCreateOrder(ModuleStoreTestCase):
         CourseModeFactory(mode_slug="no-id-professional", course_id=course.id, min_price=10)
 
         # Create an order for a prof ed course
-        url = reverse('verify_student_create_order')
-        params = {
-            'course_id': unicode(course.id)
-        }
-        response = self.client.post(url, params)
+        params = {'course_id': unicode(course.id)}
+        response = self._post(params)
         self.assertEqual(response.status_code, 200)
 
         # Verify that the course ID and transaction type are included in "merchant-defined data"
@@ -923,11 +928,8 @@ class TestCreateOrder(ModuleStoreTestCase):
         CourseModeFactory(mode_slug="professional", course_id=course.id, min_price=10)
 
         # Create an order for a prof ed course
-        url = reverse('verify_student_create_order')
-        params = {
-            'course_id': unicode(course.id)
-        }
-        response = self.client.post(url, params)
+        params = {'course_id': unicode(course.id)}
+        response = self._post(params)
         self.assertEqual(response.status_code, 200)
 
         # Verify that the course ID and transaction type are included in "merchant-defined data"
@@ -940,12 +942,11 @@ class TestCreateOrder(ModuleStoreTestCase):
         self._verify_student()
 
         # Create an order
-        url = reverse('verify_student_create_order')
         params = {
             'course_id': unicode(self.course.id),
             'contribution': '1.23'
         }
-        self.client.post(url, params)
+        self._post(params)
 
         # Verify that the client's session contains the new donation amount
         self.assertNotIn('donation_for_course', self.client.session)
@@ -957,6 +958,52 @@ class TestCreateOrder(ModuleStoreTestCase):
         attempt.submit()
         attempt.approve()
 
+    @override_settings(ECOMMERCE_API_URL=EcommerceApiTestMixin.ECOMMERCE_API_URL,
+                       ECOMMERCE_API_SIGNING_KEY=EcommerceApiTestMixin.ECOMMERCE_API_SIGNING_KEY)
+    def test_create_order_with_ecommerce_api(self):
+        """ Verifies that the view communicates with the E-Commerce API to create orders. """
+        # Keep track of the original number of orders to verify the old code is not being called.
+        order_count = Order.objects.count()
+
+        # Add SKU to CourseModes
+        for course_mode in CourseMode.objects.filter(course_id=self.course.id):
+            course_mode.sku = uuid4().hex.decode('ascii')
+            course_mode.save()
+
+        # Mock the E-Commerce Service response
+        with self.mock_create_order():
+            self._verify_student()
+            params = {'course_id': unicode(self.course.id), 'contribution': 100}
+            response = self._post(params)
+
+        # Verify the response is correct.
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response['Content-Type'], 'application/json')
+        self.assertEqual(json.loads(response.content), self.ECOMMERCE_API_SUCCESSFUL_BODY['payment_parameters'])
+
+        # Verify old code is not called (e.g. no Order object created in LMS)
+        self.assertEqual(order_count, Order.objects.count())
+
+    def _add_course_mode_skus(self):
+        """ Add SKUs to the CourseMode objects for self.course. """
+        for course_mode in CourseMode.objects.filter(course_id=self.course.id):
+            course_mode.sku = uuid4().hex.decode('ascii')
+            course_mode.save()
+
+    @override_settings(ECOMMERCE_API_URL=EcommerceApiTestMixin.ECOMMERCE_API_URL,
+                       ECOMMERCE_API_SIGNING_KEY=EcommerceApiTestMixin.ECOMMERCE_API_SIGNING_KEY)
+    def test_create_order_with_ecommerce_api_errors(self):
+        """
+        Verifies that the view communicates with the E-Commerce API to create orders, and handles errors
+        appropriately.
+        """
+        self._add_course_mode_skus()
+
+        with self.mock_create_order(side_effect=ApiError):
+            self._verify_student()
+            params = {'course_id': unicode(self.course.id), 'contribution': 100}
+            self.assertRaises(ApiError, self._post, params)
+
 
 class TestCreateOrderView(ModuleStoreTestCase):
     """

lms/djangoapps/verify_student/views.py

@@ -7,11 +7,9 @@ import logging
 import decimal
 import datetime
 from collections import namedtuple
+
 from pytz import UTC
 from ipware.ip import get_ip
-
-from edxmako.shortcuts import render_to_response, render_to_string
-
 from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.http import (
@@ -26,11 +24,16 @@ from django.utils.decorators import method_decorator
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.contrib.auth.decorators import login_required
 from django.core.mail import send_mail
+from opaque_keys.edx.keys import CourseKey
+from xmodule.modulestore.django import modulestore
+from xmodule.modulestore.exceptions import ItemNotFoundError
 
+from edxmako.shortcuts import render_to_response, render_to_string
 from openedx.core.djangoapps.user_api.accounts.api import get_account_settings, update_account_settings
 from openedx.core.djangoapps.user_api.accounts import NAME_MIN_LENGTH
 from openedx.core.djangoapps.user_api.errors import UserNotFound, AccountValidationError
-
+from commerce.api import EcommerceAPI
+from commerce.exceptions import ApiError
 from course_modes.models import CourseMode
 from student.models import CourseEnrollment
 from student.views import reverification_info
@@ -43,17 +46,13 @@ from verify_student.models import (
 )
 from reverification.models import MidcourseReverificationWindow
 import ssencrypt
-from xmodule.modulestore.exceptions import ItemNotFoundError
-from opaque_keys.edx.keys import CourseKey
 from .exceptions import WindowExpiredException
-from xmodule.modulestore.django import modulestore
 from microsite_configuration import microsite
-
 from embargo import api as embargo_api
-
 from util.json_request import JsonResponse
 from util.date_utils import get_default_time_display
 
+
 log = logging.getLogger(__name__)
 
 EVENT_NAME_USER_ENTERED_MIDCOURSE_REVERIFY_VIEW = 'edx.course.enrollment.reverify.started'
@@ -612,6 +611,21 @@ class PayAndVerifyView(View):
         return (has_paid, bool(is_active))
 
 
+def create_order_with_ecommerce_service(user, course_key, course_mode):     # pylint: disable=invalid-name
+    """ Create a new order using the E-Commerce API. """
+    try:
+        api = EcommerceAPI()
+        # Make an API call to create the order and retrieve the results
+        _order_number, _order_status, data = api.create_order(user, course_mode.sku)
+
+        # Pass the payment parameters directly from the API response.
+        return HttpResponse(json.dumps(data['payment_parameters']), content_type='application/json')
+    except ApiError:
+        params = {'username': user.username, 'mode': course_mode.slug, 'course_id': unicode(course_key)}
+        log.error('Failed to create order for %(username)s %(mode)s mode of %(course_id)s', params)
+        raise
+
+
 @require_POST
 @login_required
 def create_order(request):
@@ -676,6 +690,9 @@ def create_order(request):
     if amount < current_mode.min_price:
         return HttpResponseBadRequest(_("No selected price or selected price is below minimum."))
 
+    if current_mode.sku:
+        return create_order_with_ecommerce_service(request.user, course_id, current_mode)
+
     # I know, we should check this is valid. All kinds of stuff missing here
     cart = Order.get_cart_for_user(request.user)
     cart.clear()