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Filename : InstanceIdentifier.php

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<?php

namespace Gloudemans\Shoppingcart\Contracts;

interface InstanceIdentifier
{
    /**
     * Get the unique identifier to load the Cart from.
     *
     * @return int|string
     */
    public function getInstanceIdentifier($options = null);

    /**
     * Get the unique identifier to load the Cart from.
     *
     * @return int|string
     */
    public function getInstanceGlobalDiscount($options = null);
}