1. Sign in to WooCommerce dashboard
2. Go to: WooCommerce > Settings > General > Currency Options
3. Select your desired currency from the currency drop down and save changes.
4. Go to the API Dashboard section 'Stores' and sync products using the 'Sync products' button in the for your Woocommerce store
If you would like to change the billing currency or the currency in the API dashboard 'Products' section, please refer to the article here.