You can create various variations of chargers and addons attached to the subscription in terms of billing cycle, frequency, and so on. However, if you need to bill a customer one time, it’s easier and faster to resort to one-time charges instead of editing the subscription.
So, in the billing section, go to the Subscriptions tab, select the desired subscription and click on it.
In the subscription card in the upper right corner, select Add One-Time Charges from the list of actions.
In the pop-up window that appears, select the already created charge from the drop-down list and the amount. You can also add a discount and adjust its type and size.
To complete adding a charge, click Add at the bottom of the pop-up window.