Rein here from Shopify. This is a great question. For Payment Gateways and Shopify you are required to pick one that works for the Merchant rather than the buyer as most will integrate seemlessly.
You can view the gateways available for your specific region here. You will notice that you will need to select your specific country of residence as the gateways available to you.
If you would like you can let me know your know country and I point you in the right direction then. Let me know if you have any questions going forward.