In order to configure the free bookings within a subscription so that later customers can use hours, we will go to a specific subscription (the one we want to modify) and edit it.

We will go to the "Setting Free Bookings" option and create a new configuration.
In this tab we will enter the number of minutes to use, all this depending on the needs of the center.

Once the configuration has been entered, all customers paid for this payment can use hours when making a reservation.