Duplicate sales will occur when a sale appears in a sales file more than once or where a sales file that has been previously uploaded is uploaded a second time. To catch these situations, Feefo checks all of the order references in the sales data file being uploaded against existing order references on Feefo for the merchant account and any that are found to already exist will be marked as duplicates and only have a single feedback request email sent per order reference (excepting follow-ups). This means a customer cannot be asked for feedback for the same order multiple times.
A similar message to the following will be displayed when a duplicate sale is identified during an upload. The line items duplicated will be listed and the user will be told which sale is duplicated. For more details about upload error messages, see Uploading Sales Files: