FlyingPress supports popular WooCommerce multi-currency plugins and handles caching correctly for each currency.
Supported plugins
Aelia Currency Switcher
CURCY – Multi Currency for WooCommerce
WooCommerce Multilingual (WCML)
YITH Multi-Currency Switcher
Behavior
Pages are cached separately per currency
Only the default currency is preloaded automatically
Other currencies are preloaded on first visit after a change