Hi @ukseller44
Google needs GTIN and MPN to understand and serve your product better. I can see that you sell custom products, so it is unlikely to have GTIN. You can use our app to automatically send a null value as GTIN to the Google merchant center that will not cause an error in the feed. It will show a warning of missing GTIN, but that would not cause disapproval of feed.
You can check the Easy Google Shopping Feed app by AdNAbu, which manages your merchant center feed and other advanced features such as Multilanguage, Multicurrency, and Metafields.
You can also get in touch with our experts and request a demo.
Hope this helps.