As a programmer, I would think your description would be the easiest way to do it. In practice, I have seen demo feeds that are way off and seen this on many different brokers. Your mileage will vary. I am not talking about Coinexx in particular. I haven’t examined their demo feed in depth. They might be better than most, but I wouldn’t expect it to be the same. It cannot be. Even if they are very close, as Hyperscalper said, execution will differ.
Demo is a Sandbox, to use IT lingo. For serious Staging Environment, minimum risk on live feed is the way to go IMO.
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