When creating a coupon, through the user interface or the API, it is now possible to select the forever
frequency.
Coupons with the forever
frequency apply to all subscription invoices, regardless of the number of subscription invoices generated in a given period.
info
The value of the coupon is deducted from the amount of the invoice after tax.
Coupons do not apply to add-ons or any other one-off charges.