Redeem

Confirm and finalize the redemption of previously reserved loyalty points associated with a specific transaction identified by its tracking ID. The function attempts to confirm the points redemption for the specified transaction through the redemption manager. If successful, it returns a success response indicating that the points have been redeemed along with details such as the points utilized, the discount applied to the invoice, and the type of discount applied ('flat'). In case of any redemption exceptions, such as insufficient points or other errors, it returns an error message accordingly.