Why isnt this script that uses Spreadsheet(s) SAVING and LOADING my value?

Why isnt this script that uses GoogleSpreadsheet SAVING my value?

It posts the player's id and the value in the right place, but when the player leaves, it does not update the value in the spreadsheet. Why?

Also I have problems on line 14, where I need to get the value in the spreadsheet and insert it into the player's leaderstats.

databaseService = require(game.Workspace.DatabaseService) --//Gets the Database - module script
game.Players.PlayerAdded:connect(function(player)
	local id = player.UserId --//Gets the player's UserId
	
	
	local Brickcoins = player:WaitForChild("leaderstats"):WaitForChild("Brickcoins") --//The player's BrickCoins
	
	local globalDatabase = databaseService:GetDatabase("Global")
	if not globalDatabase:GetAsync("player-"..id) then --//if the player has not yet any data stored
		globalDatabase:PostAsync("player-"..id , Brickcoins.Value) --//Posts another "data" to the spreadsheet named for instance: "player-123456"
		print(globalDatabase:GetAsync("CoolPeople")) --//Prints the name of all the cool people stored in the database
		Brickcoins.Value = 0
	else --//And if the player has data stored, then
		Brickcoins.Value = globalDatabase:GetAsync() --//This is where I would need to get the player's saved value, but I have problems with figuring out how.
		--//Have to get the BrickCoins value the player has previously stored
	end
end)

game.Players.PlayerRemoved:connect(function(player)
	local id = player.UserId --//Gets the player's UserId
	
	local Brickcoins = player:WaitForChild("leaderstats"):WaitForChild("Brickcoins") --//The player's BrickCoins
	
	local globalDatabase = databaseService:GetDatabase("Global")
	globalDatabase:PostAsync("player-"..id , Brickcoins.Value) --Posts the player's name(currently) going to post the BrickCoins' value
	--//Have to update the BrickCoins - value the player has 
end)

Any help is greatly appreciated!