<?php
// your code goes here
$token = "4321";
$date = "2024-12-11";
$checksum = sha1($token.md5($date));
echo $checksum;
PD9waHAKCi8vIHlvdXIgY29kZSBnb2VzIGhlcmUKJHRva2VuID0gIjQzMjEiOwokZGF0ZSA9ICIyMDI0LTEyLTExIjsKCiRjaGVja3N1bSA9IHNoYTEoJHRva2VuLm1kNSgkZGF0ZSkpOwoKZWNobyAkY2hlY2tzdW07Cg==