Integration connections can have two possible status values: OK or Invalid.
If your integration status is OK, the integration connection is working normally.
If your integration status is Invalid, something is wrong and the connection is not working as it should.
The "status_reason" indicates what is the problem with the connection.
NOTE: The "status_reason" is visible on the reconnect page. If your integration says "disconnected" click the blue "reconnect" on the right side to see the details and status codes in order to repair the connection.
You can see the status of your integration via your Leadfeeder Settings by going to the tab Account and clicking the name of the in integration on the left side of the view.
Here's a list of the known values for status_reason, a description of the error, and how can it be fixed:
The Mailchimp account is not active. Remove the integration and connect a new Mailchimp account.
The entered API key is not valid. Change the API key from the settings.
Account is already integrated with Mailchimp account corresponding to provided API key