Hi,
Our store has 2 legacy custom apps that we use their Storefront API access tokens for our app to access to store data. However, one of them suddenly stopped working today (been working fine for years) with no changes whatsoever (not even scopes or anything). The error:
{"errors":[{"message":"","extensions":{"code":"UNAUTHORIZED"}}]}
Why did it happen, and will it be safe to continue to use apps like this?