mpesa-sdk-reversal.php

<?php 
// initialize Mpesa
// ...autoloading

$mpesa = Mpesa::new()->configure([
  "key" => "consumer key",
  "secret" => "consumer secret",
  "code" => "business short code",
  "till" => "business till if necessary",
  "initiator" => "initiator name",
  "credential" => "security credential"
]);

$reversal = $mpesa->reversal();

// or

$mpesa = Mpesa::new()->configure([
  "key" => "consumer key",
  "secret" => "consumer secret",
  "code" => "business short code",
  "till" => "till number if necessary"
]);

$reversal = $mpesa->reversal();
$reversal->initiator("initiator name")
         ->credential("security credential");
?>