Xero sync error - Payments can only be made against Authorised documents & Payment amount exceeds the amount outstanding on this document.

Problem Statement

You see "[Xero] 1) Payments can only be made against Authorised documents. 2) Payment amount exceeds the amount outstanding on this document" when syncing payments or refunds.

Solution

This usually happens when the same offline payment was recorded in both Chargebee and Xero. The invoice is already Paid in Xero, and the integration then tries to sync another payment for it, so Xero rejects the duplicate. Record the payment in one system only and let the integration sync it to the other.

You can record the offline payment in Chargebee in either place:

At invoice level:

At customer level: