You can test ‘Retrieving list of friends API’ and the ‘Friend picker’ without permission.
And you can request permission after completing the development of all functions.
However, the function you want is different from the function we provide.
Please check the contents below first.
Checklist to use the Messaging API and the Retrieving list of friends API
The function you want looks similar to the Biz message.
For more information on Biz messages, please contact customer center.