How to add woocommerce custom order status?

Question

I have added new custom order status to woocommerce by using following function.

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Answer 1

The order status that you're registering wc-custom-order-status is too long - 22 characters. This results in saving only the first 20 characters of the post status, which makes it invalid and causes your issue.

The order statuses are registered as post statuses, and post statuses have a limitation of 20 characters.

I suggest that you update your wc-custom-order-status status name to wc-shipping-progress, which is exactly 20 characters in length.

I'm also posting the updated version of your code, just for reference (I've only changed the status name):

// Register New Order Statuses
function wpex_wc_register_post_statuses() {
    register_post_status( 'wc-shipping-progress', array(
        'label'                     => _x( 'Shipping In Progress', 'WooCommerce Order status', 'text_domain' ),
        'public'                    => true,
        'exclude_from_search'       => false,
        'show_in_admin_all_list'    => true,
        'show_in_admin_status_list' => true,
        'label_count'               => _n_noop( 'Approved (%s)', 'Approved (%s)', 'text_domain' )
    ) );
}
add_filter( 'init', 'wpex_wc_register_post_statuses' );

// Add New Order Statuses to WooCommerce
function wpex_wc_add_order_statuses( $order_statuses ) {
    $order_statuses['wc-shipping-progress'] = _x( 'Shipping In Progress', 'WooCommerce Order status', 'text_domain' );
    return $order_statuses;
}
add_filter( 'wc_order_statuses', 'wpex_wc_add_order_statuses' );