Datacash payment module for django-oscar
This package provides integration with the payment gateway, DataCash. It is designed to integrate seamlessly with the e-commerce framework django-oscar but can be used without using oscar.
pip install django-oscar-datacash
or from Github:
pip install git+git://github.com/tangentlabs/django-oscar-datacash.git#egg=django-oscar-datacash
Add 'datacash' to INSTALLED_APPS and run:
./manage.py migrate datacash
to create the appropriate database tables.
Edit your settings.py to set the following settings:
DATACASH_HOST = 'testserver.datacash.com' DATACASH_CLIENT = '...' DATACASH_PASSWORD = '...' DATACASH_CURRENCY = 'GBP'
There are other settings available (see below). Obviously, you’ll need to specify different settings in your test environment as opposed to your production environment.
Integration into checkout
You’ll need to use a subclass of oscar.apps.checkout.views.PaymentDetailsView within your own checkout views. See oscar’s documentation on how to create a local version of the checkout app.
Override the handle_payment method (which is blank by default) and add your integration code. An example integration might look like:
# myshop.checkout.views from django.conf import settings from oscar.apps.checkout.views import PaymentDetails as OscarPaymentDetails from oscar.apps.payment.utils import Bankcard from oscar.apps.checkout.forms import BankcardForm from datacash.facade import Facade ... class PaymentDetailsView(OscarPaymentDetails): def get_context_data(self): ... # Render a bankcard form ctx['bankcard_form'] = BankcardForm() ... return ctx def post(self, request, *args, **kwargs): ... # Check bankcard form is valid form = BankcardForm(request.POST) if not form.is_valid(): ctx = self.get_context_data(**kwargs) ctx['bankcard_form'] = form return self.render_to_response(ctx) super(PaymentDetailsView, self).post(request, *args, **kwargs) def handle_payment(self, order_number, total, **kwargs): # Create bankcard object ... # Make request to DataCash - if there any problems (eg bankcard # not valid / request refused by bank) then an exception would be # raised ahd handled) facade = Facade() datacash_ref = facade.pre_authorise(order_number, total, bankcard) # Request was successful - record the "payment source". As this # request was a 'pre-auth', we set the 'amount_allocated' - if we had # performed an 'auth' request, then we woudl set 'amount_debited'. source_type,_ = SourceType.objects.get_or_create(name='Datacash') source = Source(source_type=source_type, currency=settings.DATACASH_CURRENCY, amount_allocated=total) self.add_payment_source(source)
Oscar’s view will handle the various exceptions that can get raised. See DataCash’s documentation for further details on the various processing models that are available.
There are two key components:
The class datacash.gateway.Gateway provides fine-grained access to the various DataCash APIs, which involve constructing XML requests and decoding XML responses. All calls return a datacash.gateway.Response instance which provides dictionary-like access to the attributes of the response.
from decimal import Decimal as D from datacash.gateway import Gateway gateway = Gateway() # Single stage processing response = gateway.auth(amount=D('100.00'), currency='GBP', merchant_reference='AA_1234', card_number='4500203021916406', expiry_date='10/14', ccv='345') response = gateway.refund(amount=D('100.00'), currency='GBP', merchant_reference='AA_1234', card_number='4500203021916406', expiry_date='10/14', ccv='345') # Two-stage processing (using pre-registered card) response = gateway.pre(amount=D('50.00'), currency='GBP', previous_txn_reference='3000000088888888') response = gateway.fulfill(amount=D('50.00'), currency='GBP', txn_reference=response['datacash_reference'])
The gateway object know nothing of Oscar’s classes and can be used in a stand-alone manner.
The class datacash.facade.Facade wraps the above gateway object and provides a less granular API, as well as saving instances of datacash.models.OrderTransaction to provide an audit trail for Datacash activity.
- DATACASH_HOST - Host of DataCash server
- DATACASH_CLIENT - Username
- DATACASH_PASSWORD - Password
- DATACASH_CURRENCY - Currency to use for transactions
- DATACASH_USE_CV2AVS - Whether to pass CV2AVS data
- DATACASH_CAPTURE_METHOD - The ‘capture method’ to use. Defaults to ‘ecomm’.
To work on django-oscar-datacash, clone the repo, set up a virtualenv and install in develop mode:
python setup.py develop
then install the testing dependencies:
pip install -r requirements.txt
The test suite can then be run using: