[ic] PaypalExpress payment module update

[Lyn St George]

This is a major update. It adds itemised billing to the checkout at Paypal. It 
does not send discounts or coupons as there are too many ways to get the 
numbers wrong and have Paypal reject the transaction, but it will optionally 
display a note telling the customer that discounts will be applied later.

It adds repeat billing, up to 10 billing agreements (the API maximum) at a 
time. Agreements may be set with or without an initial payment, with optional 
trial periods, with fixed or open-ended schedules, or any other variation 
allowed by the API. There are functions to manage repeat billings (only useful 
from some kind of admin panel), a function to bill outstanding arrears, and a 
function to put all details of an agreement into scratch space so as to 
display the results to a customer (or admin)

It also does refunds, masspay, 'send credit' to a credit card, and will get 
the balance of an account for display (including multi-currency sub accounts).

Find it on http://kiwi.zolotek.net

-- 
Lyn St George
eCommerce - build::support
http://www.zolotek.net