Paying for rideshares in a different country

You should be able to seamlessly use in different countries. See this advice shared in a previous post: 

Yes, if you have an account in one country, the same app and same account can be used anywhere else in the world.  (...though we have heard there are some exceptions in Southeast Asia where the payment methods are different.)

Here's a statement from Uber and also useful advice:

Uber is available in a growing number of cities around the world. If a city you visit has Uber, you can request rides there just like you would back home. Please note that your phone will need access to Wi-Fi or cellular data.

Source: https://ride.guru/lounge/p/is-uber-available-internationally-can-i-use-the-same-account

I've used Uber in at least ~7 countries, and they work fine.  No issues at all.   All charges go to my corporate visa, but they do come through as each country's local currency. (exchanged automatically by visa to USD)

One time I was in London and my Uber didn't because my phone number was  US number.

Sometimes I just get frustrated and end up taking a taxi because they're easier! Can't deal with that foreign country stuff.

Which country are you traveling? It depends on where you go