I'm not exactly sure where the question is here.  You say:

> So, this is kind of two or three questions in one:
>
> * Need to generate random code and pasted it in a document.
> * Keep a list of generated codes.
> * Create the pdf for the customer to make a hardcopy of the document.

These are all relatively straightforward things to do on a website.=20
Pretty much any server-side language can connect to a database where you
can keep track of things, PHP at least has a quite adequate PDF library,
I'm sure most of the other platforms do too.

So what exactly is the question?  Are you looking for code examples? Off
the shelf software?  A contractor?

--McD


--=20
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