This is used for handmade or one of a kind goods, and needs to have a Boolean value (true, false) in order to bypass the GTIN, MPN attributes (setting [identifier_exists] = false).
From Google Merchant Center Help:
How to fix your issue
For each product, provide the appropriate unique product identifier values (GTIN [gtin], MPN [mpn], and brand [brand]) based on our UPI guidelines. You may also need to add a value for the identifier exists [identifier_exists] attribute.
Completed
Last updated: October 31, 2024
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Hi; The plugin already supports the identifier exists attribute. If you’re having problems getting set up please reach out to the support team who can assist.