Squeak Smalltalk wrote:
> 
> We will not use a httpserver but a server.
> We will receive some data and process the data and then send it to the bank.

Why not just use the HTTP infrastructure, at least for a
first cut. Just use the file upload capability to receive
the data, process it as you need, then send it onward
(using ftp, email, socket, ... whatever).

That saves you having to build a custom server,
and having to design a data reception protocol.