Hi Hiroaki, If you upgraded a few days ago, it is likely that the email was referring to the API calls made within last 7 days. If you had migrated earlier, as you suspected, there might be other applications which are linked with your MCC which is making these API calls. Could you share the client customer Id of the MCC which owns your developer token, we can take a closer look. If you would like, you can use *reply privately to the author* option while sharing the details.
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