The Avalara integration allows you to complete a two way sync of customers between your Halo and Avalara instance. You can also send invoices, quotes and sales orders to Avalara from Halo. When sending these entities they will be created in Avalara, using Avalara’s tax functionalities to calculate the correct tax rates, this will then be synced back to Halo, updating the entity in Halo with the correct tax rates.