Could we integrate with the WhatsApp Business API?

If yes,
1. Can we run a Bulk Campaign using WhatsApp Business API? (How many contacts? Would it be Unlimited Contacts or limited to a specific number)?
2. Do we have Team Inbox (Agent) for WhatsApp Business API?
3. Is there a Drip Campaign, WhatsApp Chat Bot, WhatsApp Flows, and WhatsApp eCommerce (Payments)? If not, any roadmap for getting these features into the same plan in the future?
4. Any insights (like read, delivered, failed)?
5. Any markup fees? if no, will it be there in future? If yes in future, how much would it be?

Thanks