Look into Paddle. They handle payments, subscriptions, sales tax + invoicing and you can set your business up from virtually anywhere in the world. They act as a merchant of record, meaning they don't just calculate the tax owed they pay it on your behalf too. So even if there is a miscalculation, nobodys business is jeopardised and Paddle take full liability :) Shoot me an email if you want to chat nick.read@ paddle.com