Send PDF - email Button to a static email adress


I’ve tried to figure out how to change that, but I don’t know how.

in …/AOS_invoices/metadata/detailviewdefs.php in found the array: array (
‘customCode’ => ‘’,

how can I change the “default” email adress? I don’t want to send the invoice pdf to the customer, rather a static email adress.
Even better to send automatic an email with the invoice pdf.