For those who don't know, Shopify themselves have a registry of integrated payment methods for their platform.
https://www.shopify.com/payment-gateways
But yeah, for most of the 2nd/3rd world countries like us the most popular are gonna be Paypal and 2Checkout.
US LLC + Bank account is probably the best way to go. Thought that's quite tricky if you aren't a US resident.
After searching though a shitton of services that offer US LLC formation, the cheapest and best quality service I found and used was
Incfile -
that allow non-US citizens like us to register. Though there's also the complications of getting the LLC confirmed > then notarizing your US address > then getting the official formation documents to your US address afterwards. Then getting a US bank account where 9/10 they'll need you in person to open the account > or you can get a 'family member'/ trusted friend to do it for you at a few select banks > or try virtual online banks like Mercury > and a whole other lotta shit.
Lol it can be a bit stressful depending on your country (certain EU countries have it easier with certain banks and such), but worth it. A lot goes into getting it all set up though. Not necessarily too hard, but tedious and technical. That'd require a whole guide thread of itself lol.