Phase One - essential services to support

[judgej]

• [x] Wirecard checkout page (a redirect method)
• [x] purchase
• [x] acceptNotification
• [x] completePurchase

It is expected that authorisation will be minimal additional work, thouse capture would be needed to support that.

Technical specifications for the checkout page (aka Hosted Payment Page, or HPP) is here: https://document-center.wirecard.com/pages/viewpage.action?pageId=786859

Wirecard Checkout Page and Wirecard Checkout Seamless are very similar to configure. It may be beneficial to start with a Wirecard Checkout shared messages and extend from there for Page and Seamless.

The Page service provides access to an off-site payment page. All additional security such as 3D Secure are handled offsite in the single path. The Seamless service allows an on-site payment page to be used with AJAX tokenisation of card details. The seamless service may still require an offsite visit to a bank for 3D Secure or PayPal or other destinations for some other payment methods.

Support for the following payment types:

• [x] Credit card
• [x] PayPal
• [x] Sofort (German payment provider)

[judgej]

These all done. Some unit tests would be nice too, but still working on those.