Email is a solution (Score 1)

One solution is to attach the software on an email to the customer. Building the database, website, administration website and online payment solution for international creditcards can be done in about 3 weeks by a single programmer (for a simple e-commerce site that has the basic functionality). Such a website can more or less run itself. Accounting can be done automatically aswell, although your country may have laws that forces you to do the accounting manually.