[Woocommerce] Remove user registration

Hi!
I’m a newbie in the wordpress / woocommerce world.
I’ve created a store with woocommerce, but i need users not be able to register (not even at checkout). So only the users we create and send the user/password info can shop in the store.

Is there a way to do so?
I can’t find any info about it.

Thanks in advance.
Regards!