Let's write some coupons!
This is an advanced feature for power users. There is no way to undo writing a coupon.
Coupons incentivize money being spent 1) at a specific destination, 2) above some minimum amount, and 3) with restrictions like: limit one per customer.
Future vault coupons are plain bitcoin cash unspent transaction outputs (UTXOs) that have been sent to, and are then locked by a simple contract to incentivize spending money at a specific destination (a FBCH token vault). For example, an output of 100k sats can be sent to a coupon contract to be used for locking at least 1 BCH (min. value) into 1 FBCH at a vault contract (destination).
Coupons values are denoted in BCH sats, where the value of the coupon is the value of the unspent output. A whole BCH could be split into 1000 coupons each offering 100k sats for placement, or 1 BCH coin could be sent to the coupon contract in one single output to let anyone lock a "free" FBCH.
These "C0" series coupons are to lock 1 x 10^0 BCH, but there are smaller and larger amounts (i.e C1 for 10 BCH placements and C-1 for 0.1 BCH vault placements).
Coupons are not refundable. Money sent to a coupon holding contract can only be redeemed in a transaction that sends the required amount of value to a second predefined contract (i.e. a future vault).
Below is a simple tool for use with the Electron Cash pay-to-many feature: