//$url = 'https://YOUR-INSTANCE-NAME.chargeover.com/api/v3';
$authmode = ChargeOverAPI::AUTHMODE_HTTP_BASIC;
$username = '******';
$password = '******';
$API = new ChargeOverAPI($url, $authmode, $username, $password);
// The invoice we want to update
$invoice_id = 10009;
// Build up the object
$Invoice = new ChargeOverAPI_Object_Invoice();
$Invoice->setDate('2015-06-08');
$LineItem = new ChargeOverAPI_Object_LineItem();
$LineItem->setItemId(3);
$LineItem->setLineRate(29.95);
$LineItem->setLineQuantity(3);
$LineItem->setDescrip('Add this new line item to the invoice.');
$Invoice->addLineItems($LineItem);
// To keep the existing line item, you have to pass the line_item_id
$LineItem = new ChargeOverAPI_Object_LineItem();
$LineItem->setLineItemId(2575);
$Invoice->addLineItems($LineItem);
$resp = $API->modify($invoice_id, $Invoice);
/*
print("\n\n\n\n");
print($API->lastRequest());
print("\n\n\n\n");
print($API->lastResponse());
print("\n\n\n\n");
*/
if (!$API->isError($resp)) {
$invoice_id = $resp->response->id;
print 'SUCCESS! Invoice # is: ' . $invoice_id;
