Hi

When WooCommerce have separate input for saving transaction id then why it transaction ID is saved under order notes?
Can you please update code to save transaction id under input box.
See in this screenshot in mentioned link below.

For reference see this one, https://www.ads-software.com/support/topic/payment-method-and-transaction-id/

May be u need to add one line in success part.
update_post_meta( $order_id, '_transaction_id', $transaction_id, true );
OR
WC_Order::set_transaction_id( $value );

The plugin is not working with the new api, please update the plugin code