To detect eBay orders, Fastbay checks eBay custom label value from products of the order itself against your Prestashop catalog.

This means that , in standard configuration, module expect that your eBay orders are coming from products that were previously synced at least one time by Fastbay
with the proper “module” custom label (see eBay orders section for more information about how the module is compiling eBay custom label by either adding
the Prestashop ID product or the Prestashop product reference).

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 orders.

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).