<- Loyalty API
Redeems a loyalty reward.
The endpoint sets the reward to the
REDEEMED terminal state.
If you are using your own order processing system (not using the Orders API), you call this endpoint after the buyer paid for the purchase.
After the reward reaches the terminal state, it cannot be deleted. In other words, points used for the reward cannot be returned to the account.
A unique string that identifies this
Keys can be any valid string, but must be unique for every request.