How do I accept international payments in my app?

I run a business which accepts payments in my local African country. It's done well with flows of over $100K and due to demand, I want to accept international payments. I registered the company in the U.S. from home, and I am currently based in the U.S on an F1 Visa (doing masters). I tried stripe but they asked for social security (which I don't have). Whats the best way to accept international (US, UK, Europe) payments for my company?