boltTLDR
Google explicitly warns Shopify merchants not to uninstall and reinstall the Google & YouTube app, as the Content API to Merchant API migration will happen automatically by August 18.
SERoundtable reports that Google has clarified confusion around its upcoming Merchant API migration for Shopify users. Contrary to earlier rumors, merchants do not need to uninstall and reinstall the app; Google will handle the transition automatically. Ginny Marvin, Google Ads Liaison, confirmed that reinstalling the app currently triggers product ID formatting changes that can cause loss of historical performance data, a separate bug Google is fixing in the coming weeks.