During the onboarding process, after the customer has chosen a product, he is able to redeem coupon codes. The coupon codes are only associated with the newly created account, but are not validated for redeemability at this point. After the onboarding has been completed and the trial subscription has been created, the estimated discounts can be seen in the detail view of the subscribers billing view. Setup fee and period fee discount estimates will be shown directly, whereas metered fee discounts will just be indicated and not estimated, since they vary depending on the subscribers usage of metered services. Upon activating the account, the real subscription is created and the coupon codes are being redeemed. It is possible, that the redemption fails at this point if the previously valid coupon code has become unredeemable in the meantime (eg. due to an end date redemption rule).