Thank you Guust, that explains why this option „suddenly“ vanished. I recently switched the package to recurring.
This is what I would like to achieve:
A. Offer a 1 year paid premium-package to all customers which they can pay for voluntarily. That means, they can either enter a discount code which sets the invoice to zero, or they can transfer the regular fee via Pre Bank Transfer (I do not want to offer any other payment method).
B. Send an E-Mail to all premium-package customers every year a few days before the listing expires, which kindly reminds them that there will be a new invoice in their BuddyPress profile invoice tab, which should either be paid for renewal, or zeroed by reentering the discount code.
How could I achieve that?