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

    public function transform($data)
    {
        if (!$this->getClientId($data->customer)) {
            return false;
        }
        if ($this->hasInvoice($data->invoice_num)) {
            return false;
        }
        return new Item($data, function ($data) {
            return ['client_id' => $this->getClientId($data->customer), 'invoice_number' => $this->getInvoiceNumber($data->invoice_num), 'po_number' => $this->getString($data, 'po_so'), 'invoice_date_sql' => $this->getDate($data->invoice_date), 'due_date_sql' => $this->getDate($data->due_date), 'paid' => 0, 'invoice_items' => [['product_key' => $this->getString($data, 'product'), 'notes' => $this->getString($data, 'description'), 'cost' => (double) $data->amount, 'qty' => (double) $data->quantity]]];
        });
    }