Add-ons are supplementary charges applied on top of a subscription's main price.
In OpenPay, add-ons are configured as prices that can only be purchased with other prices.
When creating a new subscription, you can include add-ons by following these steps:
Select the customer from the dropdown.
Select a price for their subscription.
Click the “Add-ons” button next to the price to see a dropdown of available add-ons.