Receiving the normal price of an item when returning an item instead of the discounted price

Q: If a person sells a certain item and a discount was given to the customer and thereafter the customer wants to exchange the item or be refunded for it, will it be permissible to subtract the discount given (proportionally)? If the discount is not reversed will it be regarded as interest?

Secret nikaah and publicizing it after a while

Q: I am a 53 year old divorced female. My first cousin is 62 and he is recently divorced. We are both single, and are considering making Nikah. Because our families are very close, we are afraid that if we have a public Nikah, and the marriage subsequently does not work, this will cause immense stress on the entire family. Is it possible for us to do a non-public / secret Nikah for a while and then if all works out, we will then tell the family that we are married.

eBucks

Q: Kindly please advise.

My husband has a credit card which he uses to do transactions and alhamdulillah all these transactions are interest free. He uses it for convenience so he doesn't need to carry cash. By using this card he earns ebucks points which have accumulated and will be very valuable in purchasing necessary appliances in the home. Is the purchasing of these items with the ebucks points permissible?