This error is generated when the account code mentioned in the error is archived or deleted from Xero.

This error occurs when an invoice with same number is already in Xero and other order with the same number is trying to sync.

This article will help you understand how tax can be synced as a line item

This article explains the approaches for the reconciliation of the orders from payment methods other than Shopify and PayPal.

This feature syncs the refunds to the separate Xero account instead of default sales account.