The app has a tipping function what should appear after the ride is complete. If you feel your driver was worthy, you can tip them at that point.
Random thought: If you think life lacks variety, the next time you are at an airport just watch people go by. I had to wait for about an hour on my flight home yesterday and found it pretty entertaining. My favorite thing was playing a game in my head called, "Guess the next person to trip on the moving sidewalk because they are paying to much attention to their phone."
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