Messenger notifications - Terms of service Problem

Hello, I have a question, Does the Messenger notifications - Terms of service is free, the publisher is free to use Messenger notifications - Terms of service, Right?

[alemoppo]

Hi, yes, the messenger notification service is free.
But first it must be approved by Facebook, it is not an easy operation and often the approval happens after many attempts.

It is important to explain that you do not use the service to advertise, but for educational and informational purposes.
Use examples of content posted on your site and explain the notification goal. Don't write phrases like "visit my blog" or "see here". Don't use exclamation marks and question marks.

Bye!

Thank you so much.