Steps:- 
1. Add Device in WAChat new Portal by scanning the QR Code
2. New Field Vendor-Id added in the page "WhatsApp Configuration" in SysSuperAdmin
3. Provide URL, Registered ContactNo with country code, WhatsApp NameSpace, and Vendor-Id (2)
4. Use the NameSpace from WAChat Portal -> Rest API -> Copy API Key
5. Now Test Message
