Read more about Exporting Invoices and changing the Export Format.
Spoonfed allows you to Export Sales Invoice information (in an .XLSX format) for importing into Xero (Desktop or Client/Server version).
The import will update your Customer Ledger Account, the Income Account and, if applicable, the Sales Tax Liability Account in Xero.
Change Format to Xero
To set your Spoonfed account to produce the Export document in the required Xero format, go to Setup > Organization > Invoicing > Account System 'Xero'.
If a Customer already exists in Xero, then the Customer Name in Spoonfed must exactly match the Customer Name in Xero. Otherwise Xero will create a new Customer. This will lead to more than one account for the same Customer in Xero and result in confusion.
It might be a good idea only to create new Customers in Spoonfed, that way you won't get multiple accounts being created.