There's a new version of the HubSpot API

As of November 30, 2022, HubSpot API Keys are being deprecated and are no longer supported. Continued use of HubSpot API Keys is a security risk to your account and data. Your API Keys could be deactivated at any time after Nov. 30th, and we recommend that you migrate to Private Apps as soon as possible so you do not lose business-critical functionality.

How do I find the app ID for a HubSpot app?

Your app ID can be found below the name of your app when viewing the Apps dashboard in your developer account.

app_id_list

The app ID is also displayed when viewing the auth settings for your app.

app_auth_id_settings