Task – FOS features – 3

Hi! The next thing I’d like here is a function on the single fos-invoice cpt template that checks
– the GET params for (for example) – https://freedomonlineservices.com/fos-invoice/rebecca-31-03-25?send_test=1
– checks that ‘is sent’ checkbox for that fos-invoice is NOT checked
– and also for admin-user- logged-in.