Hey Parvez, I hit a version of this building a Telegram bot for myself. Official APIs really don't want you reading stuff you don't own, so there's no clean way around it, you already know that. If you go the Whapi route I'd just plan for the number to die eventually, keep it read-only, nothing important tied to it, and build it so swapping it out is a five-minute job, not a rebuild. Honestly I'd also just ask the group admins if they'll forward it themselves, way less headache than fighting WhatsApp long term. Is it a personal tool or something you're trying to sell?