How is the ID of an item built in the Merchant Center feed ?

In the normal mode of the standard edition, g:id uses the feed country, not its language.

Item Construction Fictional example
Simple product shop prefix + COUNTRY code + product ID BMUS6
Combination shop prefix + COUNTRY code + product ID + separator + combination ID BMUS1v2

Here BM is the prefix, US the United States country code and v the configured separator. An English feed targeting the United States uses BMUS1v2, not BMEN1v2. A French-country feed uses FR.

With simple IDs, prefix and country disappear: 6 or 1v2. The separator can differ from v. PRO can offer other modes; inspect their output.

Keep IDs stable. For remarketing, compare the XML g:id with items[].id sent for the same product. See prefixes and the simple-ID setting.

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