@Eve, for Europe YOU HAVEN'T to be an OFFICIAL entrepreneur to make an invoice. If you can't generate an automatical invoice you can make it in free form, even hand written and so on.
So if someone from Europe want to get such an invoice you can simply send him such an invoice.
No need to have a setting in CB, SER to only send recaptcha...thats done automatically
Latest version of CB and SER support this service and also wrong solves are reported. Again nothing has to be configured, works out of the box.