Undefined function wc_get_order_statuses()

Hello everyone,
I would like to add some code that i’ve made in a custom plugin.
It is working fine but the files are in the WordPress root folder.
When I’m including these files as a plugin, I have an error on wc_get_order_status() function.
Basically the function where it is called is just getting every order which have the processing status from the last 24h. I am just using wc_get_order_status() to get all statuses of Woocommerce and unset every statuses that I do no care about (completed for example)
Thank you by advance.

function get_orders_by_custom_date()
{
    date_default_timezone_set('Europe/Paris');
    $now = strtotime('now');
    $today =  date("m/d/Y H:i:s", $now);
    $before_today = date('m/d/Y H:i:s', strtotime('-1 day'));
    $order_statuses = wc_get_order_statuses();

    unset($order_statuses['wc-pending']);    
    unset($order_statuses['wc-on-hold']);
    unset($order_statuses['wc-cancelled']);
    unset($order_statuses['wc-refunded']);
    unset($order_statuses['wc-failed']);
    // unset($order_statuses['wc-completed']);

    $query_args = array(
        'post_type'      => array('shop_order'),
        'post_status'    => array_keys($order_statuses),
        'posts_per_page' => -1,
        'date_query' => array(
            'after'     => $before_today,
            'before'    => $today,
        ),
    );
    $customer_orders = get_posts($query_args);
    return $customer_orders;
}

• This topic was modified 3 years ago by nerosylius. Reason: Forgot the code