Syncing your Abacus account is simple. To get started, navigate to the Synced Accounts section of the left hand side menu.
From here, scroll down and find the options for Abacus and click the Sync button.
A new menu will appear on the right side of your screen. It will explain that in order to sync Abacus, you must log into your Abacus account and download the expense report for the last 3-6 months or (from the day before your last upload) as CSV. The instructions for this process can be found here.
Once you've uploaded the correct CSV, you will be able to complete your team's sync with Abacus.