I have to agre with Jon - quite a broad request... And these things aren't
usually hard to do, and most likely they will necessitate using things like
web services for the stock quotes (often you have to pay to use them, and
each provider tends to have their own proprietary "API"). Pretty hard to
make a site like that. Same for payment processing, there aren't a whole lot
of places that will process credit cards (and sometimes you need a merchant
account or such), so that makes it difficult again to provide helpful
samples... Calculating things like shipping and tax (both tend to vary by
location) can be a pain too, and again, it is very dependent on what
courriers you use and where you live - can't provide useful sample code yet
again. Banking-wise, well, it depends what you mean by that. If you mean
things like loan calculators and such, then it's only a matter of knowing
the math. As for balance transfers and such, then your underlying DB tends
to matter quite a lot (these things are very transactional), business rules
depend on the schema, etc.
If you're more specific in your request perhaps we know of something that'll
help, but often you'll just have to do it all by yourself.
