I have tested all your recommendations on https://healthcarentsickcare.com/advanced-metabolic-panel product URL
Google structured data testing tool results in https://i.imgur.com/HkoK1hL.png
Rich snippet testing tool result https://i.imgur.com/WPs4fMe.png
1) Aggregate rating and review
There was one review already added by me and one more added (not actual user review, I have added from product edit page)
Review and aggregate ratings are not showing a warning, it’s showing ERROR in structured data testing and showing as WARNING in Rich snippet testing tool.
2) SKU and Availability
I am using auto SKU generating plugin and this plugin generated SKU by default to product pages. All the pages are having a unique SKU. Regarding availability, I have again edited the above URL and added availability. Check here https://i.imgur.com/OlGwbGF.png
3) Brand Warning
I have already taken the product category as brand but changed it to product tag after your recommendation. I also tried to add the code your given to functions.php file but after adding the code, my website broken (removed later). I kept product tags from the dropdown option as a brand and tested.
4) GTIN, ISBN, MPN issue
I cant add or use plugin for GTIN because we are into a health service business and not selling any products. Still, I welcome your further advice on this for service business entities
5) PriceValidUntil Warning
Again I have added offer price and its validity like this https://i.imgur.com/jRDEzJ0.png and tested.
You can check the results in the above screenshots and please advise further. I am open to keeping ‘warnings’ but how to get rid of those ERRORS from the shop page, all product categories, product tags, and product pages?
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