I have used Uber/Lyft many times all over the country and in Europe. Never had my credit card compromised. Also when you open your app you put in the address or location you want to go to. It will give you several different options for Uber, including style of vehicle and how many people it will hold. You simply select the option that best suits you. When you have arrived at your destination it will ask you if you would like to add a tip. Uber drivers make very little money off the fee. The tip is really necessary for them to actually make decent money while working for Uber. Hope this helps.
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