Being unable to wash one's feet in a basin for wudhu

Q: From birth I have a congenital hip dislocation problem due which I am not able to lift my leg till the height of the wash basin. In most offices, people wash their feet in the wash basins but I can't do that to wash my feet.

Please advice if I can:

1. Do masah on my feet.

2. Wet the complete foot by rolling a wet hand.

3. Use a commode to wash my feet where a Muslim shower is available.

Four people staying in a room which was booked for two people

Q: I stayed with friends at a rented accomodation where in the agreement, only 2 people are allowed to stay each night for around 100$ per night. However, we lied to the owner and agreed that only 2 people will stay while actually 4 people stayed. We didnt think this was wrong since we would only use the accomodation for sleeping and wanted to save money. So technically we broke the agreement and cheated the owner.

What is the best way to fix this as we are afraid that in the akhirah, we will be punished, since we used his property not according to the agreement. If we reach out to him, he may take action against us so we are afraid. Could we pay him the money for the 2 extra people (we assume it will be 50$ per night per person) and give it to him anonymously? Or can we just donate this amount to chairty because we are afraid to tell him.

Receiving cash back or discounts when purchasing with a credit card

Q:

1. When purchasing goods via a credit card, I received 1 rupee on every purchase of 200 rupees. Is this permissible or not?

2. Different offers are available on credit card and easy paisa accounts everyday. If we purchase and make some payments and order some food via the credit card and easy paisa account, then we will receive a special discount or cash back. Is this permissible or not?

If this is "sood" then what is best use of this amount.