How to get player count from a seperate place?

How would you find the amount of players in a seperate game with code?

I’m making a game about roblox throughout the years and I need to find a way to see how many players are in a certain place image

I don’t need the exact code I just need to know what I should know to learn how to find this, do I need to find an API, locate a service, etc?

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I forgot the exact thing but its with the marketplace api where you treat the id you would put for the item as the game id, returning an array of data containing in one of the coloumns, the amount of visits. From there you can like save data of the amount of visits per day ig