How can I test user visits from various countries for my web app?

Mocking the user's location is a straightforward approach. It lets you simulate the experience without needing to leave your development environment.

If you're using the browser's Geolocation API, you can easily spoof the location using Chrome Dev Tools or modify settings in Firefox through about:config. Another option is to write tests that mock the geolocation API, allowing you to return any location you need and check if the correct prices are displayed for that country.

I'd suggest looking into what programming language your app is built in, as some have built-in libraries or tools that can assist with geolocation testing.

You might want to consider using a VPN to change your location while accessing your app. Also, it could help to have an override mechanism in place that allows you to test with a specific header or URL parameter to simulate different countries.