Question about paid subscription and PMs box

[Goodman_2020]

Hi,

I've created a paid subscription. When you pay it, you go from registered user to "premium user" become premium user allow to use the private messages and its inbox.
I wanted to set the permission to subscribe to only registered users and not the other (not premium too, as far as they are premium members, it means they have already paid).
So i was wondering something:

When a subscription ends, the premium member become again a "simple" registered users, and so he can't use anymore the private message and the inbox BUT if for example 2 days pass after the subscription ends and the member want to become again a Premium member to have access to PM and his PMbox...will the messages in its PMbox will be saved and still in the box when he will become again a premium member?

Thx