WooCommerce disable BACS for subscriptions

init.php

<?php

function woo_disable_bacs_for_subscriptions( $available_gateways ) {
    global $wp;
    if ( class_exists( 'WC_Subscriptions_Cart' ) ) {
        //  2.6+ compatibility
        $cart_contains_renewal = function_exists( 'wcs_cart_contains_renewal' ) ? wcs_cart_contains_renewal() : WC_Subscriptions_Cart::cart_contains_subscription_renewal();
        if ( is_checkout_pay_page() ) {
            $order_contains_renewal = function_exists( 'wcs_order_contains_subscription' ) ? wcs_order_contains_subscription( $wp->query_vars['order-pay'] ) : WC_Subscriptions_Order::order_contains_subscription( $wp->query_vars['order-pay'] );
        } else {
            $order_contains_renewal = false;
        }
        if ( WC_Subscriptions_Cart::cart_contains_subscription() || $cart_contains_renewal || $order_contains_renewal || WC_Subscriptions_Change_Payment_Gateway::$is_request_to_change_payment ) {
            if ( isset( $available_gateways['bacs'] ) ) {
                unset( $available_gateways['bacs'] );
            }
        }
    }
    return $available_gateways;
}
add_filter( 'woocommerce_available_payment_gateways', 'woo_disable_bacs_for_subscriptions', 11 );