The reward points earned through the purchase will be deducted from your point earnings (which can include bonus points) once the transaction has posted to your account. If you had redeemed all your reward points before making the return, this will be reflected through a negative balance in your reward point accumulation in your online portal. By being aware of how credit card returns work, you can better keep track of updates to your monthly statements and your credit reward earnings as well as become more informed of which credit cards to use internationally.