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PhortuneCartImplementation.php
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			<?php

			abstract class PhortuneCartImplementation extends Phobject {

			/**
			* Load implementations for a given set of carts.
			*
			* Note that this method should return a map using the original keys to
			* identify which implementation corresponds to which cart.
			*/
			abstract public function loadImplementationsForCarts(
			PhabricatorUser $viewer,
			array $carts);

			abstract public function getName(PhortuneCart $cart);
			abstract public function getCancelURI(PhortuneCart $cart);
			abstract public function getDoneURI(PhortuneCart $cart);

			public function getDescription(PhortuneCart $cart) {
			return null;
			}

			public function getDoneActionName(PhortuneCart $cart) {
			return pht('Return to Application');
			}

			public function assertCanCancelOrder(PhortuneCart $cart) {
			switch ($cart->getStatus()) {
			case PhortuneCart::STATUS_PURCHASED:
			throw new Exception(
			pht(
			'This order can not be cancelled because it has already been '.
			'completed.'));
			break;
			}
			}

			public function assertCanRefundOrder(PhortuneCart $cart) {
			return;
			}

			abstract public function willCreateCart(
			PhabricatorUser $viewer,
			PhortuneCart $cart);

			}