What is the simple ID?

Under Basic settings, simple product ID removes the shop prefix and country code from standard-edition IDs. Example: BMUS6 becomes 6. When each combination is exported separately, its suffix remains: BMUS1v2 becomes 1v2 with separator v.

Choose the format matching your Google catalogue and advertising tracking, then keep it stable. Enabling this option systematically can create new identifiers and break existing matches. See full ID construction.

If you use Google Dynamic Remarketing, compare a feed g:id with the items[].id sent for the same product. Check both a simple product and a combination: the identifiers must match for tracking to find the catalogue items.

PRO has its own ID modes; check the active mode and final value. A simple ID is not always the product number alone when variants exist.

For detailed requirements: Official Google documentation.

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