php - WooCommerce change status for BACS orders based on specific shipping methods

one text

Solution:

Try the following instead (code is commented):

add_action( 'woocommerce_thankyou', 'bacs_order_payment_pending_order_status_shipping_method', 10, 1 );
function bacs_order_payment_pending_order_status_shipping_method( $order_id ) {
    // Get WC_Order object from the order Id
    $order = wc_get_order( $order_id );
    
    // Check that we get a WC_Order
    if ( is_a( $order, 'WC_Order' ) ) {
        // Shipping Methods to check
        $shipping_methods_to_check = array( 'flat_rate', 'request_shipping_quote' );
        
        $condition = $order->get_payment_method() == 'bacs' && $order->has_status( 'on-hold' );

        // Loop through shipping items (objects)
        foreach($order->get_shipping_methods() as $shipping_item ){
            // Check for matched defined shipping methods
            if( in_array( $shipping_item->get_method_id(), $shipping_methods_to_check ) && $condition ){
                $order->update_status( 'custom-status' ); // Change order status
                return; // Exit
            }
        }
    }
}

Code goes in functions.php file of the active child theme (or active theme). Tested and works.

related: Change Woocommerce Order Status based on Shipping Method