3rd Party Gateway Module - Default Type Invoices

[tuga]

Hi,

How do I set a 3rd gateway module to act as Invoice and not CC?

What I've on MetaData:

function modulename_MetaData()
{
    return array(
        'DisplayName' => 'modulename',
        'APIVersion' => '1.1', // Use API Version 1.1
    );
}

 

When I activate the module I see on tblpaymentgateways:

modulename type CC

and I've to change it to:

modulename type Invoices

How do I make Invoices default on activation?

Thank you.