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Could you help us?
Our Shopify products are automatically generated with SKU numbers when they are synced to Google Merchant Center via the Google & YouTube app, rather than the SKUs we manually entered in Shopify. This has caused us significant difficulties.
Hello - we will utilize Shopify's Global ID format on product exporting, since they give a unique product and variant ID for EVERY product in your database, and it will be unique across the entire ecosystem. Since "SKU" field in Shopify is not required, and can be duplicated, it would cause issues in Google if we tried to use that as our unique identifier on products, since some products would be missing it, and others would be duplicated.
If you need SKU to persist into Google, we'd recommend adding those values to the Google MPN field in Shopify > Products > Metafields > Google MPN. This would let you see this field in Google Merchant Center by adding the MPN Column in the all products view.
Here is a handy bulk editor link to use:
https://admin.shopify.com/store/_______your_store_name_without_the_myshopifycom_part______/bulk/product_variant?resource_name=ProductVariant&edit=sku%2Cmetafields.mm-google-shopping.mpn