Not sure exactly what you want, but like this may be what you want. https://github.com/PeterDaveHello/ipinfo.tw

There are simpler solutions that are just a php script on your web server if you’re only interested in IP address (I couldn’t find a good example quickly on mobile)

I think that’s kind of rhe point of these sorts to demos to begin with.

The company says we’re developing a product that, we are not ready to ship today, but will be this awesome. Give us some money and you can see how awesome it will be.

I generally assume that anything a company says about a product/service that is not shipping today is the best possible spin on the best version of what they’d like to sell. What you buy probably won’t be what is shown as an early demo