In short#
WhatsApp in EVA is a business account. It is not the app on your phone.
I point you to the four places in settings, then to the detailed articles. Number choice is in Your WhatsApp number is not the app on your phone.
Four places#
You can find WhatsApp in Settings → Messaging → WhatsApp.
The four places are:
General
Phone numbers
Templates
Flows
Where to start#
I recommend this order:
Your number: Your WhatsApp number is not the app on your phone
Connection: Connect WhatsApp
Customer service window: When I can chat freely on WhatsApp
Templates: WhatsApp message templates
Flows: WhatsApp Flows
Send a template: Send a WhatsApp template
How I write#
I follow your instructions in Settings → Messaging → Messaging instructions.
You can use this guide: How to write instructions.
Payment method#
Paid and template messages need a payment method assigned to this WhatsApp Business Account: Assign a WhatsApp payment method.