App\Ninja\Import\Wave\PaymentTransformer::transform PHP Method

    public function transform($data)
    {
        if (!$this->getInvoiceClientId($data->invoice_num)) {
            return false;
        }
        return new Item($data, function ($data) {
            return ['amount' => (double) $data->amount, 'payment_date_sql' => $this->getDate($data->payment_date), 'client_id' => $this->getInvoiceClientId($data->invoice_num), 'invoice_id' => $this->getInvoiceId($data->invoice_num)];
        });
    }