I already found out that pdf attachments are not supportet. Though I would like to send customized invoices to my list and wondered if there are functions to grab custom subscriber meta by id/hash in my wordpress page? This way I could utilize a custom endpoint with my newsletters and generate invoices when ppl click the link.
Hi, if you have a subscriber’s ID you can get the full object (matching the table fields wp_newsletter) using Newsletter::instance()- >get_user(subscriber id)