<?php
use Payum\Core\Model\Order;
use Payum\Core\Reply\HttpRedirect;
use Payum\Core\Reply\HttpResponse;
use Payum\Core\Request\Capture;
use Payum\Offline\PaymentFactory as OfflinePaymentFactory;

$order = new Order;
$order->setTotalAmount(100);
$order->setCurrencyCode('USD');

$payment = OfflinePaymentFactory::create();

if ($reply = $payment->execute(new Capture($order), true)) {
    if ($reply instanceof HttpRedirect) {
        header("Location: ".$reply->getUrl());
    } elseif ($reply instanceof HttpResponse) {
        echo $reply->getContent();
    } else {
        throw new \LogicException('Unsupported reply.', null, $reply);
    }
}

<?php
use Payum\Core\Request\GetHumanStatus;

$payment->execute($status = new GetHumanStatus($order));

echo $status->getValue();

<?php
use Payum\Core\Request\Authorize;
use Payum\Core\Request\Cancel;
use Payum\Core\Request\Refund;

$payment->execute(new Authorize($order));

$payment->execute(new Refund($order));

$payment->execute(new Cancel($order));

<?php
use Payum\Core\Storage\FilesystemStorage;
use Payum\Core\Extension\StorageExtension;
use Payum\Core\Model\Order;

$order = new Order;
$order->setTotalAmount(100);
$order->setCurrencyCode('USD');
$order->setNumber(uniqid());

$storage = new FilesystemStorage(sys_get_temp_dir(), get_class($order), 'number');

$payment->addExtension(new StorageExtension($storage));

// do execute