Possibility to register to an event only per coupon

I've created an dateless event to generate a coupon/voucher (e.g. coupon 100% discount, usable x times / voucher with a specific amount). 
So I can sell packages of min. 3 bookable events. I don't want that a user only buys one event.
With this coupon/voucher I'd like to register to other events exclusively.
How can I manage that the other events have a price but no possibility to use an payment except these generated coupon/voucher?

Regards
Martin

Sorry Martin but it is not possible. In Events Booking (and guess all other system) coupon is optional. If users have coupon code, they will get discount. If not, they will pay full price

There is no option to make coupon code required like that unless you will have to customize code of the extension yourself

Regards,

Tuan

OK, thanks anyway.
I'll do it somehow myself
Regards

OK, great . Good luck !

Tuan