How Do I Fix the 'Payment amount exceeds...' Error in Xero?

This error usually indicates that the invoice associated with the error may have been manually marked as paid in Xero. When Recurly then attempts to sync the actual payment to that invoice, it is seen as an overpayment and the sync fails.

To prevent this from happening, you should avoid manually marking invoices as paid in Xero. Once the invoices have the correct balance due, the Recurly transaction syncs will work as expected.