Need automatic webinar attendance certificate generator with real watch-time verification

I run live and recorded webinars for my audience and want to stop issuing attendance certificates by hand. Right now I either send the same document to everyone who registered, regardless of whether they watched, or spend hours after each session checking logs myself. I need a tool that ties certificate generation directly to real viewing behaviour during a single broadcast, not overall course progress — this is about presence during one event, separate from any course-completion certificate.

The system should track how long each participant actually stayed watching, not just whether they clicked the join link once. Only people who cross a minimum watch-time threshold that I can configure should be eligible, and everyone else should simply not receive a certificate. Certificates need to be generated and delivered automatically right after the webinar ends, showing the participant's name, the event title and date, and their actual watch percentage. I also want a dashboard showing every participant's watch time and certificate status at a glance.

What I'm looking for:
— tracking of watch duration per participant, resistant to someone leaving the tab open without watching;
— configurable minimum watch-time percentage for eligibility;
— automatic generation and delivery right after the broadcast ends;
— an admin statistics view for all participants of a given webinar;
— support for both live sessions and recorded, on-demand viewing.