CC Tweaked banking_public3 - Card Payment Transaction System

os.pullEvent = os.pullEventRaw
local tArg = {...}
local Reader = peripherals.find("reader")
rednet.open(peripherals.find("modem"))
local VertifyState = "unvertified"
local ServerId
local Key = "0000"
local Amount = tArg[1]
local Item = tArg[2]

local function Clear()
term.setBackgroundColor(colors.lightBlue)
term.clear()
term.setCursorPos(1,1)
print("|",VertifyState,"| Banking System | banking_public3 | ")
end

function Getkey()
centerText(h/2, "Please Enter Pin")
term.setCursorPos(5,(h/2) + 1)
local input
repeat
    input = read("*")
until string.len(input) == 4
Key = input
end

function GetCard()
centerText(h/2, "Please Swipe Card Now")
local side, id, data = os.pullEvent("mag_swipe")
centerText(h/2, "Vertifying Card")
local Mes = {id,data,Key,Amount,Item}
rednet.send(ServerId,textutils.serialize(Mes),"4523")
local a, b, c = rednet.receive("4523")
if a == ServerId and b == "accepted" then
    os.queueEvent("Transaction_Accepted")
elseif a == ServerId and b == "declined" then
    os.queueEvent("Transaction_Declined","Rejected by Server")
end
end

function getServer()
ServerId = rednet.lookup("4523","Ser_B_1")
end

getServer()
if Amount > 40 then
    Getkey()
end
GetCard()