As a subscriber, I'm prompted to confirm my country before payment

[chrisjsimpson]

Is your feature request related to a problem? Please describe.
Some shops have no desire to support muti-currency and/or when they do it's important subscribers confirm the detected country is correct.

Describe the solution you'd like
As a shop owner I can set the currency of my shop to disable automatic currency detection

Describe alternatives you've considered

Additional context