peter-checkout

[honest rain]

as far as I know Checkout localises to the browser locale. You would use https://stripe.com/docs/api/checkout/sessions/create#create_checkout_session-locale to override that

customer.preferred_locales only effects other surfaces like Invoice PDFs I think, it's a bit disjointed unfortunately

[grim nebula]

I've just seen, that 'auto' might work. I'll give it a try.