In case you require a new API token, we have a public Piano API endpoint /publisher/app/api_token/generate that you can use.
More information is available here.
The new, updated API key will then be available on your Piano dashboard's homepage.
After the API token reset, you will need to change it on your side in any place, that you are calling our API or otherwise using it.
Note that this action does not reset the Private Key value.