Migrate a product feed from Google Content API for Shopping to the Merchant API v1 before the August 2026 shutdown

Verified steps

1. Audit your existing Content API integration: list all methods called (products.insert, products.update, productstatuses.list, etc.) and map each to its Merchant API v1 equivalent using the compatibility overview at developers.google.com/merchant/api/guides/compatibility/overview.
2. Create a new OAuth 2.0 credential (or reuse the existing one) and update your scope to include https://www.googleapis.com/auth/content — the Merchant API uses the same OAuth scope as Content API.
3. Update the base URL from https://shoppingcontent.googleapis.com/content/v2.1/merchantId/ to https://merchantapi.googleapis.com/products/v1/accounts/merchantId/ and adjust resource naming (products become 'accounts/{id}/products/{productId}' in Merchant API).
4. Replace products.insert/update with products.productInputs.insert using the dataSource ID; retrieve your dataSource ID with datasources.list — each feed (primary, supplemental) is a separate dataSource.
5. Test by inserting a sample product and calling products.get to verify attributes are mapped correctly; use the Merchant API's productStatuses resource to confirm approval status.
6. Run both APIs in parallel (dual-write) until you confirm parity, then cut over before August 18, 2026 — Content API returns errors after that date.