I would like to create an addon with a specific period
A non-recurring addon or one-time addon does not get renewed. So it can be used for a one-off purchase such as extra data with an internet subscription.
Click here to read more about non-recurring addons in PC 1.0.
In PC 2.0, Charges represent products or services that are non-recurring, either purchased once immediately or scheduled for purchase when certain events happen such as subscription activation, trial start, and so on.
Click here to know more about Charges/non-recurring addons in PC 2.0.