Disable payment method for certain countries

woo-cartcheckout.php

/**
 * Desabilita pagamento por Transferência para clientes não PT
 */

function mw_payment_gateway_disable_country( $available_gateways )
{
    global $woocommerce;
    if ( isset( $available_gateways['bacs'] ) && $woocommerce->customer->get_country() !== 'PT' ) {
        unset( $available_gateways['bacs'] );
    }
    return $available_gateways;
}
add_filter( 'woocommerce_available_payment_gateways', 'mw_payment_gateway_disable_country' );