Hi,
I've created a special coupon that give 100% discounts on the normal price of subscriptions.

With an user of mine I've tryed to buy a subscription and I've insert the special coupon. The basket show the discount and the total amount to pay is 0€.
So I click on Terms and conditions checkbox and then to "Pay" button linked to Paypal.

The browser send me to a special page powered by paypal that ask me to insert a valid amount to pay...

How can avoid this? An user, after insert the coupon code, should get the subscription without paying nothing...

Thank you

krileon wrote: If the coupon applied makes it completely 100% off and the price is for sure $0 you should see a "Confirm Order" button instead of the regular payment buttons as shown below.

Are you applying a static amount discount or a percentage discount?

I've put % discoun of 100%.
Maybe I've changed something into the configuration settings?
To show CONFIRM ORDER, how I've to set the payment?

As you can see into the image, even if there is the 100% discount the TOTAL appear 0 and not FREE and there is only the paypal button...

No,
I've set only manual recurring...

The page I've screenshoted is just an upgrade subscription from a free lifetime subscription.