You will find details about data/security and privacy details here
WhatsApp exposes the WhatsApp display name and the phone number of users interacting with any WhatsApp business platform account. The details around the messages sent or received is also available for any WhatsApp business platform account. Data that is available for any WhatsApp business platform account can be found here.
All the messages sent or received are relayed through secure Turn clusters/servers which is why you could see all the interactions inside Turn interface. The messages are end-to-end encrypted but as a BSP Turn is handling those messages to sent or received via WhatsApp. That means as a business service providers we have access to those messages so that we could handle the transaction.
Having said that, any WhatsApp business can delete their messages using our APIs anytime they want. That operation would delete all interactions from our servers.
Deleting a chat : https://whatsapp.turn.io/docs/index.html#delete-a-chat
Archiving a chat https://whatsapp.turn.io/docs/index.html#archiving-a-chat