src/Payum/Core/Bridge/Propel/Storage/Propel1Storage.php
protected function doGetIdentity($model)
    {
        $id = $this->getModelId($model);

        if (count($id) > 1) {
            throw new LogicException('Storage not support composite primary ids');
        }

        return new Identity(array_shift($id), $model);
    }
protected function doGetIdentity($model)
    {
        $id = $this->getModelId($model);

        if (count($id) > 1) {
            throw new LogicException('Storage not support composite primary ids');
        }

        return new Identity(array_shift($id), $model);
    }
{@inheritDoc}