What is the purpose of assigning a "shop" prefix to product IDs?
With Use the IDs of the products in the back-office, the shop prefix distinguishes items from several shops feeding one catalog. Choose a stable, different prefix for each shop when numeric IDs could overlap.
The construction is: SHOP PREFIX + optional LANGUAGE PREFIX + PRODUCT ID + optional separator and COMBINATION ID. Example: BMFR1v12. Without the language prefix, that example becomes BM1v12.
Set the prefix in Basic settings. Reference and EAN modes have their own rules; see ID modes.
Warning: changing a prefix changes feed IDs. Check equality with Pixel content_ids and the effect on existing items and campaigns before changing it. For country or language feeds sharing the same items, disable the LANG prefix: see this setting.

Other FAQs in this category
- How to send quality images to Facebook?
- What is the product GTIN code for?
- How to indicate the availability of my products on Facebook?
- What is the product condition?
- What are Facebook's product data guidelines?
- What are Facebook's requirements for shipping weights?
- What are the guidelines for product titles?
- What are the price guidelines to follow?
- Do I have to provide the brand of my products in my feed?
- Do I have to provide product colors in the feed?
- Do I have to include product sizes in the feed?
- What are the Facebook's requirements for product description?
- Is it necessary to indicate an age group for using my products?
- Do I have to indicate the gender for which my products are made?
- Do I have to provide information about my product patterns?
- Do I have to provide information about my product material?
- What is the product supplier reference (MPN code) for?
- What is the "product type" attribute?