Yes, you can change your payment method for an Uber ride after it has been completed, provided the trip was made within the last 30 days (or 60 days for business accounts). This is particularly useful if you accidentally used a personal card for a work trip or vice versa. To do this, go to "Activity" or "Your Trips" in the app, select the specific ride, and navigate to the "Help" or "Get Ride Help" section where you can select "Switch Payment Method for a Past Trip." However, there are strict limitations: you generally cannot switch between "Cash" and "Digital" methods (e.g., you can't pay cash then ask for a card charge later), and you cannot switch to or from certain third-party wallets like Apple Pay or Google Pay once the transaction is finalized. The new payment method must already be registered in your Uber wallet at the time of the switch.