Creating a Zoom / Streamyard style online meeting & streaming solution

We need an online meeting and streaming software that allows one or more participants to have a browser (WebRTC) based video and audio meeting, with the possibility to export the meeting in RTMP to be shared through our own video streaming site, Facebook, YouTube etc. Features should be more or less identical to what Zoom and Streamyard provide: A lobby (waiting room), hand raising, text based chat, muting and voicing of participants by the stream moderator, etc. Paywall should be created so that the free version of the service has only limited features (max 4 participants, max duration of the meeting 1 hour, RTMP streaming available only to one fixed site) while the paid-for version allows more participants, unlimited meeting length, and RTMP streaming to up to five freely selectable targets. The solution should be built using Mediasoup / Kurento / OpenVidu. The paywall should support Paypal and Stripe.