WhatsApp BSUID changes

Hey Pablo! 

Here is the information I could find: 

• Phone number moves to additionalIdentifiers. This is an additive change. Code should read the phone number from additionalIdentifiers.phoneNumber instead of externalId.
• Phone number may be absent. If a user has enabled WhatsApp usernames, their phone number may not be included in webhooks at all. Integrations should not assume it is always present and should build a fallback for any logic that requires it.

There is a way to get the phone number if it’s there and being shared (unsure what these conditions are, it’ll depend on Meta) but there is no guarantee one will be there so you’ll need to consider other options for the integrations and have a fallback in case there is no number. 
Please bear in mind this is a change initiated by Meta to support usernames and in certain cases no phone number is attached to that account. 

Hope this helps!