I have 798 active items on Google Merchant Center. However, there are also 19 items disapproved. 15 of them have the Mismatched value (page crawl) [price] Issue. I checked the historical post of this issue in the community, but didn't find the solution. It might not be the template problem, because 798 items are active and run well. And, I cannot edit the Content API feed manually.
Please help me out!
There can be a couple of issues.
1) You change the prices and Google Merchant Center (GMC) has not processed the new data yet
2) You have automatic price updates enabled and that is causing issues (disable by going to GMC > gear icon > automatic improvements)
3) Structured data is not valid. Copy the URL of the product in your data feed and test it using: https://search.google.com/test/rich-results
Make sure the data matches what you submit in the data feed.