>>>I'd like to make invoices for my clients by using VFP and Microsoft Word. Any code or white paper is available somewhere to help me figure it out?
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>>I'm wondering why do you want to use Word?
>
>You wouldn't believe it, but there are people of all kinds. Some may even think that automating Office is a good idea. Which, truth be told, sounded great when it was new, but aged very badly. Some may even remember only that old idea as if it was still new, and choose to forget everything that came later.

We used https://templater.info/ in a c# project.
It doesn't require Word installed.
Using a Word template, it creates a Word document output.
It does some things amazingly well - multi detail bands and other things.
And some things need a real report engine.

Good Luck!