App\services\ImportService::addInvoiceToMaps PHP Method

    private function addInvoiceToMaps(Invoice $invoice)
    {
        if ($number = strtolower(trim($invoice->invoice_number))) {
            $this->maps['invoice'][$number] = $invoice->id;
            $this->maps['invoice_client'][$number] = $invoice->client_id;
            $this->maps['invoice_ids'][$invoice->public_id] = $invoice->id;
        }
    }