Do you use Xero or QBO?  A2X integrates well with either.  Connecting A2X to your accounting software is easy.

When you sign up for a trial account, you will see this place to connect your accounting software:

Connect to Xero or QBO.png

You need your login credentials handy to connect.  Follow the instructions to complete the connection and then you will be redirected to A2X.

If you ever need to Reset your connection, Refresh your Cache (bring in new accounts, tax rates, or tracking from your accounting software), 

or Disconnect your accounting from A2X, go to Setting, and then Connections:

Next: Set up Account and Tax Mapping