Automatically set orders to Processing

functions.php

/**
 * Set all WooCommerce orders to Processing
 * Based on https://docs.woocommerce.com/document/automatically-complete-orders/
 */
add_action( 'woocommerce_thankyou', 'custom_woocommerce_auto_complete_order' );
function custom_woocommerce_auto_complete_order( $order_id ) { 
    if ( ! $order_id ) {
        return;
    }

    $order = wc_get_order( $order_id );
    $order->update_status( 'processing' );
}