How to set up GameAnalytics?

I am trying to use GameAnalytics for my Roblox game, but I’m having some troubles with it.

I know that GameAnalytics has it’s own SDK, but since that is way too advanced for what I need, I want to make my own scripts for it, using HttpService. But it seems as I can’t do that, on the GameAnalytics-site it says this:
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Does this mean that I can’t use GameAnalytics without using their SDK? Or is there a way that I can use my own scripts?