What Type of WhatsApp Business Account is needed? Global account or Country Specific?

The WhatsApp channel of the Sinch Conversation API has the ability to send to, and receive from, any WhatsApp subscriber, globally, subject to opt-in requirements.

One API = One Sender Identity = One API Phone Number. A unique API is required for each Sender ID the customer requires, and a unique phone number must be assigned to that API.

Learn more about the Sinch WhatsApp Business API.