Thank you for reaching out! Currently, SliceWP isn’t multi-currency compatible. This feature is on our development log, however, at this time I can’t say when it will be available.
Unfortunately, considering the situation, for now I can’t recommend using SliceWP to power your affiliate program. I’d love to be able to help you somehow, but at the moment I don’t have a solution to multi-currency setups.
Thank you and best wishes,