Map ProductInput writes to the correct Merchant API data source.

Identify the canonical owner of product data before changing code: custom service, ecommerce platform, feed app, agency middleware, or manual file feed.

Store the Merchant API dataSource resource name in auditable configuration and document which service is allowed to write to it.

Preserve product identity by comparing old product IDs, returned Merchant API resource names, feed labels, target countries, ads joins, and reporting joins.

Scope limitation: the scanner cannot see Merchant Center source configuration unless optional live validation is added later.

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