Odoo-14 WhatsApp API Integration

I’m running Odoo 14 and want to connect it seamlessly with the official WhatsApp Business API. The immediate goal is to automate marketing and lead-generation messages straight from Odoo, with the option to monitor or capture incoming replies inside the CRM afterward.

Here’s the current situation:
• No WhatsApp Business API account yet, so I’ll need guidance through Facebook Business verification, number onboarding, and any Twilio/360dialog or direct Meta setup you recommend.
• Odoo 14 is already live; studio and developer mode are enabled, but no WhatsApp modules have been installed.
• Message templates for campaigns are drafted; I just need them uploaded, approved, and triggered from standard Odoo workflows (e.g., new lead, stage change, or scheduled mailings).

What I expect from you:
1. End-to-end setup of the WhatsApp Business API account, including all verification steps.
2. Installation or custom development of the Odoo connector that can send bulk and transactional messages, log conversation history, and, if feasible, fetch incoming messages into the CRM chatter.
3. A short hand-off document or screen-share showing me how to create new templates, schedule broadcasts, and check delivery statistics.
4. Basic testing to confirm that at least one outbound and one inbound message flow works.

If you’ve already deployed WhatsApp integrations for Odoo 14, please tell me which libraries or gateways you used and share a brief timeline estimate.