Hook that removes Client Group Discount on billable items

[DennisHermannsen]

Hi,

I've created the following hook that removes the Client Group Discount for billable items.

<?php
use WHMCS\Database\Capsule; 
add_hook('InvoiceCreation', 1, function($vars) {
	$invoiceItems = Capsule::table('tblinvoiceitems')
		->where('invoiceid', $vars['invoiceid'])
		->get();
	
	$invoiceLines = Capsule::table('tblinvoiceitems')->where('type', 'GroupDiscount')->where('invoiceid', $vars['invoiceid'])->get();
	$deleteLineID = array();
	foreach($invoiceLines as $lineID){
		$deleteLineID[] = $lineID->id;
	}
	foreach($invoiceItems as $key){
		if($key->type == "Item"){
			$billableItem = true;
			break;
		}
	}
	if($billableItem == true){
			$command = 'UpdateInvoice';
			$postData = array(
				'invoiceid' => $vars['invoiceid'],
				'deletelineids' => $deleteLineID,
			);
			$results = localAPI($command, $postData);

		}
	
});

I'd like to get some feedback on this or just tips to make it better.