WhatsApp Integration

First off, thank you to this amazing platform for enabling us to ask questions and share ideas — it's incredibly valuable! 

We’re currently implementing a brand new WhatsApp integration via Digital Engagement, and I was hoping to gather some best practices from those who’ve done this before.

Specifically, I have a few questions: 

1. Meta Business Account setup  
   Is it best to register a
   Meta Business Account under the client’s business entity rather than using a personal Meta account? - I think this is a "No brainer - Yes"  
     
    

2. Phone number strategy  
   Is it a good practice to:
   • Use one phone number for the Production setup, and
   • Get a separate number linked to the same Meta Business Account for the Dev/Sandbox environment to support development and testing? I believe we should not test using the Number that is in use for day-to-day business purpose.
3. General setup advice  
   What are some “must-do” items or best practices when setting up WhatsApp for Salesforce? 

Any recommendations, advice and suggestions would be of great help.