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Welcome, Tiu. I am Cory.
Unfortunately, Uber does not sell gift cards anymore. If you want to pay for a ride of another person, you would have to add your credit card to the account.
If you do not want to do that, then you can setup an event here. - https://event.uber.com/ by setting up the event, you can setup trips and how much you will pay per trip.
If you need a step-by-step guide, you can go here. - http://www.wikihow.com/Give-Uber-Credit-As-a-Gift
While they do not offer gift cards, Uber Events is another practical solution to fit the needs of paying for a ride or rides of someone else.
I hope I have answered your question today.
Please let me know if this answers the question you are asking.
I am following up with you to see if you were able to use the Uber event feature to pay for rides.
Let me know if you have any other questions.
Please do not forget to rate my answer above for assisting you with this question.