I have GoogleApps Marketplace app in which I'm using "Integrate with Google" button to start the google OAuth2 process. The button disappeared two-ish days ago as far as I can tell. I'm receiving the error 404 - https://apis.google.com/marketplace/button
Is there a temporary issue in google API? I can update my app if needed as well. I've also made a ticket in Google's issue tracker https://issuetracker.google.com/issues/113072052 (inadvertently marked as a feature).
Exact same symptoms as: "Integrate with Google" button suddenly disappeared (receiving 404)
this should be fixed now. Sorry for the inconvenience.
This affected only listings that are unlisted in Chrome Web Store. Installing unlisted apps is not supported in G Suite Marketplace and we would like to understand how/why you are using this feature.