woocommerce force setup_future_usage=off_session

a.php

if (!function_exists('wcs_order_contains_subscription')) {
    function wcs_order_contains_subscription(mixed $order): bool
    {
        // Pretend that the order contains a subscription, to force `setup_future_usage` to `off_session`.
        return true;
    }
}

if (!function_exists('wcs_is_subscription')) {
    function wcs_is_subscription(mixed $_order): bool
    {
        return false;
    }
}

if (!function_exists('wcs_order_contains_renewal')) {
    function wcs_order_contains_renewal(mixed $_order): bool
    {
        return false;
    }
}