Fastbay uses as a custom string (named “order filter”) to recognize products a code composed, by default, of the word “prestashop” – “Product ID”.
When a synchronization is performed, this value becomes the eBay custom label.
This is the module’s default behaviour, so when downloading an order, the module checks the value of the Ebay custom label for a reilable product recognition even if the module is getting uninstalled / reinstalled.
In the case of a product with variations, the order filter will also show the id of the combination (e.g. prestashop-34-1).
You can change this behavior through this option, available in the Orders tab of the module:
Use product reference as eBay custom label
This feature will allow you to enable sending the product reference/variant as a custom eBay label.
By enabling this option, the standard order download functionality of the module (order filter + product id) will be ignored.
It is therefore necessary to make sure that all products / variants sent to eBay have a custom label correctly populated with the same product reference of your site before enabling it.
Also, if your module is in production, make sure to download any pending undownloaded order before switching to this behaviour.
NOTE:
To prevent undownloaded orders, it is mandatory that all Prestashop products have a valid and unique reference.
In the Utility section of the module you can find a tool that will allow you to generate a CSV of the products on your site with duplicate / empty references in order to correct them before activating this mode.