This is a way to Sats prices on your WooCommerce (WC) store products by using BTC (Bitcoin) currency that gets shipped with WC. It does still show BTC on checkout pages and on the backend.
So internally WC will use BTC and you need to enter amounts in BTC, e.g. 0.00002100 but on the frontend for product pages it will show 2100 Sats
Navigate to WC settings: WooCommerce -> Settings -> General (tab): "Currency options"
Currency: select Bitcoin (B)
Currency position: select Right with space
Thousand separator: enter what you prefer ,
,
or .
or sth else