Trying to access vendor metafields in Liquid

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I'm working with an app by a vendor.  I know from experience with the Google App by Shopify, that I can access product metafield data using:


How can I find out how to access the vendor's database? They're storing the same data and providing services for Google Ads & Google Merchant Center.  I just want to access the same values associated with the product so I can create structured data markup.