To detect orders from eBay, module checks eBay custom label from products of the order itself against your Prestashop catalog.
This means that , in standard configuration, module expect that your eBay orders are from products that were previously synced by Fastbay
with the proper “module” custom label (see order section for more information about how the module is composing eBay custom label).
If you already have products / orders on eBay prior to the module installation, the only way Fastbay can detect orders (and can link products
between eBay / products in order retrieval) is that your eBay custom label matches with Prestashop product reference.
If so, you can enable the “Use product reference as custom eBay label (read manual) ” option (in Order tab => Settings) and perform the lookup again
to detect order. Note that enabling this option will also tell the module to use your product’s reference as eBay custom label when adding / revising items,
this will require all of your website products / variations to have a valid and unique reference (see “Orders” section of the manual for more details on this function).