WooCommerce: Disable BACS if Customer Checkout Country Out of Singapore

functions.php

add_filter( 'woocommerce_available_payment_gateways', 'bacs_disable_outside_singapore' );
//Disable bacs if the country not in Singapore
function bacs_disable_outside_singapore( $available_gateways ) {
	global $woocommerce;
	if ( isset( $available_gateways['bacs'] ) && $woocommerce->customer->get_country() <> 'SG' ) {
		unset(  $available_gateways['bacs'] );
	} 	
	return $available_gateways;
}