How to make tables that can be used across multiple games belonging to multiple different people/groups

1. I want a table that can be called and set across various games on roblox with the key

This could be used for making an universal inventory, universal purchases. This is the first thing I want to do with this.

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Next thing I want to do with this is universal events. For example. Game 1 can called a nuke, and almost instantly and seamlessly, Game 2 will spawn in that nuke. This must be able to be done without any exhaustions, since last time I done it it was successful but very prone and fragile to exhaustions, and it was only me who tested it. Think of this happening multiple times a minute, across different servers in different games. This must be pulled off using a high quality server HTTP thing that isn’t prone to exhaustion almost imediately after use. This is for the mass use, have servers combined total of one thousand people.

If you are using multiple places in one Universe, you can use Cross-Server-Messaging, but if you have multiple universes then you have to use HttpService and there is really no way around it (Unless there are other methods that I don’t know of, and if there are some, please correct me).

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HOW exactly do I use HTTPService? Alot of people just tell me “Use HTTPService” but HOW and WHERE are my questions. What website do I use and how do I use it efficiently to the point that it can support at least 10 players saving data at the same time?

You would have to do something like set up a database and a REST api to let Roblox servers interface with it. I’ve done it before with a postgres server hosted on heroku. They should have tutorials for setting one up. Heroku is free but there is a limit to how much you can store.