When I started, Stripe was not yet available in my country, Latvia (it now is). Personally I've had good experience with Braintree. Particularly their support

When I started, Stripe was not yet available in my country, Latvia (it now is). Personally I've had good experience with Braintree. Particularly their support has been impressively good – they take time to respond, but you can tell the support agents have deep knowledge of their system, they have access to tools to troubleshoot problems, and they don't hesitate to escalate to engineering.