WP Fastest Cache

Hi,

I am using WP Fastest Cache too. I have installed the premium version but cant get the cache to work.
What I did was :
1. In WooCommerce → Settings → General → Default customer location make sure you have selected: Geolocate with page caching support
2. Registered and input Maxmind GeoIp key licence
3. Open wp-config.php file via FTP then insert define(‘WPFC_CACHE_QUERYSTRING’, true);

But the currency switcher did not change even though I clicked to switch currency.

I need the currency a customer selected to stay throughout the customer session regardless of which page (e.g /shop /home) they navigate too.
If possible without the query string option.

Please advise thanks.

I will send you admin access seperately