Kata:There's No Business like E-Business

Summary

Client wants to build a toolset/framework/whatever for creating e-business portals for small businesses (customers) to sell to their customers (users)

Users

(up to) millions of users per customer, (up to) thousands (or more) of customers

Requirements

all the usual requirements of an e-commerce package (reliability, user management, money exchange (credit cards, checks, other?), etc); no customer-facing hosting; minimal customer administration; internationalization mandatory