You cannot Instance this class with Instance.new()
This class cannot be accessed by client sided scripts.
Maximum 30 requests can be made in a mintue.
When using this service in local playtest: Your datastore WILL be saved into your computers storage under the username given by local server. Check workshop settings to disable this or to clear existing databases.

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Functions

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GetDataStore(int user_id)

This function is used to get datastore of the user id given. Returns DataStore. You must use a Connect function in-order to perform things with the datastore! An example: 
local DataStoreService = Game:GetService("DataStoreService")
local Players = Game:GetService("Players")
DataStoreService:Connect("OnDataStoreLoad", __SCRIPT__, "CallOnDataStoreLoad")
Players:Connect("OnPlayerEntered", __SCRIPT__, "OnPlayerEnter")

function OnPlayerEntered(Player)
    DataStoreService:GetDataStore(Player.userId)
end

function CallOnDataStoreLoad(DataStore, user_id)
    if DataStore ~= nil then 
        printl("Loaded for player with id: " .. user_id)
    else
        DataStoreService:CreateDataStore(user_id) -- once it is done creating data store, it will again call the OnDataStoreLoad signal
    end
end

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CreateDataStore(int user_id)

local DataStoreService = Game:GetService("DataStoreService")
local Players = Game:GetService("Players")
DataStoreService:Connect("OnDataStoreLoad", __SCRIPT__, "CallOnDataStoreLoad")
Players:Connect("OnPlayerEntered", __SCRIPT__, "OnPlayerEnter")

function OnPlayerEntered(Player)
    DataStoreService:GetDataStore(Player.userId)
end

function CallOnDataStoreLoad(DataStore, user_id)
    if DataStore ~= nil then
        local PlayerCoins = DataStore.Get("Coins")
        printl("Loaded for player with id: " .. user_id)
    else
        DataStoreService:CreateDataStore(user_id) -- once it is done creating data store, it will again call the OnDataStoreLoad signal
    end
end

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Signals

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OnDataStoreLoad

Called when a datastore is done loading. Example: 
local DataStoreService = Game:GetService("DataStoreService")
local Players = Game:GetService("Players")
DataStoreService:Connect("OnDataStoreLoad", __SCRIPT__, "CallOnDataStoreLoad")
Players:Connect("OnPlayerEntered", __SCRIPT__, "OnPlayerEnter")

function OnPlayerEntered(Player)
    DataStoreService:GetDataStore(Player.userId)
end

function CallOnDataStoreLoad(DataStore, user_id)
    printl("Loaded for player with id: " .. user_id)
end

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OnInternalError

This signal will never be emitted during local playtest
Called when there is a error with loading datastore. Example: 
local DataStoreService = Game:GetService("DataStoreService")
DataStoreService:Connect("OnInternalError", __SCRIPT__, "CallOnDataStoreLoadFailure")

function CallOnDataStoreLoadFailure(VPS_ERROR_RESPONSE_CODE, VPS_ERROR_ANY_DETAIL)
    -- this will automatically be forwarded to developers
    printl(VPS_ERROR_RESPONSE_CODE)
    printl(VPS_ERROR_ANY_DETAIL) 
end