App\Ninja\Import\Invoiceable\PaymentTransformer::transform PHP 메소드

    public function transform($data)
    {
        return new Item($data, function ($data) {
            return ['amount' => $data->paid, 'payment_date_sql' => $data->date_paid, 'client_id' => $data->client_id, 'invoice_id' => $data->invoice_id];
        });
    }