v1.01

Changes
Removed for i,v in t loop in AccountStore:AddAccountAsync() and changed it to the DeepCopy(t) function

local AccountService = require("./path/to/accountService")
local Template = { coins = 0 }

local AccountStore = AccountService.new("DataBlahBlahBlah", Template)
game.Players.PlayerAdded:Connect(function(Player)
        AccountStore:AddAccountAsync(Player.UserId)
        local acc = AccountStore.Accounts[Player.UserId]
        
        print(acc)
end)

game.Players.PlayerRemoving:Connect(function(Player)
        AccountStore:SaveAccountAsync(Player.UserId)
end)

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v1.00.1

The first release of AccountService.

Changes
Fixed AccountStore:AddAccountAsync(Key: any)

local AccountService = require("./path/to/accountService")
local Template = { coins = 0 }

local AccountStore = AccountService.new("DataBlahBlahBlah", Template)
game.Players.PlayerAdded:Connect(function(Player)
        AccountStore:AddAccountAsync(Player.UserId)
        local acc = AccountStore.Accounts[Player.UserId]
        
        print(acc)
end)

game.Players.PlayerRemoving:Connect(function(Player)
        AccountStore:SaveAccountAsync(Player.UserId)
end)

v1.00

The first release of AccountService.

local AccountService = require("./path/to/accountService")
local Template = { coins = 0 }

local AccountStore = AccountService.new("DataBlahBlahBlah", Template)
game.Players.PlayerAdded:Connect(function(Player)
        AccountStore:AddAccountAsync(Player.UserId)
        local acc = AccountStore.Accounts[Player.UserId]
        
        print(acc)
end)

game.Players.PlayerRemoving:Connect(function(Player)
        AccountStore:SaveAccountAsync(Player.UserId)
end)