We are using Stripe as a very professional and relivable partner to manage payments.
Unfortunately changing currencies seems to be a huge struggle in accounting - thats why they do not allow it.
Here is a very nice article that also highlights the general EU VAT problems (thank you Satago.com!). In difference to Statago tried to allow you to pick your favourite currency and not letting you pay in USD / EUR or GBP in general. Still the downside is - once you picked your currency you will need to stick with it.
As soon as there is any enhancement available here of course we will integrate this in CloudWok.