API: AcceptOrder ‘sendregistrar’ on domain renewal?

[btidude 0]

Hi,

I’m using the API function ‘AcceptOrder’ to accept  new domain orders when an invoice is marked as paid and send them to the registrar which works fine for NEW domain orders:

https://developers.whmcs.com/api-reference/acceptorder/

$results = localAPI('AcceptOrder', [
    'orderid' => 123,
    'registrar' => 'myregistrar',
    'sendregistrar' => true,
    'autosetup' => true,
    'sendemail' => true,
]);

But the issue I have is for domain RENEWAL orders. The order is accepted ok but NOT sent to the registrar (the registrar renew function is not called in the registrar module).

If I manually accept the domain renewal order in the Admin area (checking 'send to registrar') it works just fine.

Is this expected behaviour or am I doing something wrong? 

Thanks for any advice.