This question is rather vague, so the answer cannot be precise, but I can suggest that you rewrite your billing application so that the output for each client is defined by a configuration file specific for each client.

Thus, every time a client wants something different, you haul out your configuration file and start tinkering. After a while you'll have a variety of formats and you can start with a solution that's close to the one your client wants, and go from there.

Alex / talexb / Toronto

"Groklaw is the open-source mentality applied to legal research" ~ Linus Torvalds

In reply to Re: Electronic Billing question - where to start by talexb
in thread Electronic Billing question - where to start by galitska

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