<?php
$email="test@chakratechnology.com";
$timestamp=round(microtime(true) * 1000);
$bankCode="008";
$bankAccount="8760673566";
$amountTransfer="10000";
$purpose="tes transaksi";
$key="de56f832487bc1ce1de5ff2cfacf8d9486c61da69df6fd61d5537b6b7d6d354d";
$paramSignature = $email . $timestamp . $bankCode . $bankAccount . $amountTransfer . $purpose . $key; 
$signature = hash('sha256', $paramSignature);
echo $timestamp."<br/>";
echo $signature."<br/>";