How to remove lines from an Invoice using 'consolibyte/quickbooks-php' - php

Question

Is there a way to remove lines from an invoice using the Consolibyte quickbooks toolkit?
I can send invoices with lines but I would also like to update an invoice and I think the best way would be to remove each line and then send up the lines as they are currently. i.e: To update an invoice I would first get the invoice from quickbooks using the ref I store locally, remove the lines, then update the fields on the invoice object, then add the new lines and then send the invoice using the update method.
I have seen this example:
https://github.com/consolibyte/quickbooks-php/blob/master/docs/partner_platform/example_app_ipp_v3/example_invoice_update.php
But I am unsure how I could update individual lines as I have no reference to them stored locally, hence trying to remove them and then re-create.

Answer 1

Found the answer here:
How to access Quickbooks Invoice Line Items using php api
My solution looks like this, using Laravel:
public function qbUpdateInvoice(Invoice $invoice)
{
if ($invoice->qb_ref == null) {
throw new \Exception('Invoice Quickbooks ref not available.');
}
$qbInvoice = $this->findInvoiceByRef($invoice);
$count = $qbInvoice->countLine();
for ($i = 0; $i < $count; $i++) {
$qbInvoice->unsetLine($i);
}
$qbInvoice = $this->setInvoiceDetails($invoice, $qbInvoice);
$qbInvoice = $this->setInvoiceLines($invoice, $qbInvoice);
$response = $this->qbInvoiceService->update($this->context, $this->realm, $qbInvoice->getId(), $qbInvoice);
if (!$response) {
throw new \Exception($this->qbInvoiceService->lastError());
}
return $response;
}