Output BTC as Sats value for WOOCS (WooCommerce Currency Switcher)

functions.php

// Assumption is that you fetch the correct Bitcoin exchange rates for the currency code ($currencyCode) "BTC". 
// Adjust accordingly in the code below if you use a different one.

// On WOOCS settings you can add a custom symbol for "Sats" and display it accordingly.

// Use WOOCS currency data manipulation filter to adjust rate and decimals.

add_filter('woocs_currency_data_manipulation', 'my_woocs_currency_data_manipulation', 1, 1);

function my_woocs_currency_data_manipulation($currencies)
{
	$currencyCode = 'BTC'; // Adjust this if your Bitcoin currency code is not BTC 
	foreach ($currencies as $key => $value)
	{
		if ($key === $currencyCode)
		{
			// We multiply the Bitcoin exchange rate with 100 million. 1 BTC == 100 000 000 Sats.
			$currencies[$key]['rate'] = $value['rate'] * 100000000;
			$currencies[$key]['decimals'] = 0;
			break;
		}
	}
	return $currencies;
}