Twilio Integration (Whatsapp)

In the configuration.yaml these lines are added

twilio:
  account_sid: !secret twilio_SID
  auth_token: !secret twilio_auth_token

the constants !secret twilio_SID and !secret twilio_auth_token are defined in the file secrets.yaml

In Twilio Phone Numbers we need to purchase a number that is able to deliver SMS.

Then in Twilio Console > Messaging > Senders > Whatsapp senders we need to create a new sender which we will link to the Twilio phone number we created and we will need to fill up business information and link our Meta Business account with our Twilio account (that's only for the first sender, later we should in theory be able to add more for the same Twilio + Meta account).

2 integrations are needed: Twilio and Twilio SMS:

https://www.home-assistant.io/integrations/twilio/
https://www.home-assistant.io/integrations/twilio_sms

When the Twilio integration is added from Settings > Integrations, you will get a popup showing what webhooks to add in Twilio Console. Copy that information and head to Twilio Console > Messaging > Senders > Whatsapp senders and click on the sender we are using. There you will find something like below: