which payment processor is this?

Its one I devolved myself using paypal as a base. I fixed my original problem by updating to latest version.

One last question: can i have multiple payment processor together to give multiple options to customers?

thanks.

yes, you can install more than one payment option

Ok I am trying to modify authorize.net gateway (/tmpl/form.php) but I see that

$data->x_invoice_num

returns the payment number instead of invoice number

in the paypal plugin you use a different method to retrieve info

echo plg_invoices_escape($vars->row->invoice_num)

that works ok in paypal

how to get invoice number in authorize.net?

thanks,

the same way. try using $vars->row->invoice_num