Formstack Sync requires an API key to access MailChimp.
To create a new API key:
- Login to MailChimp
- Click on the drop-down menu near your name in the upper right-hand corner and select "Account"
- Click on the "Extras" drop-down menu and select "API Key"
- Click the "Create a Key" button to create a new API Key.
Once you have your API Key, enter it into the "API Key" field on the "Connector Settings" screen in Formstack Sync and click "Next". You will then be prompted to "Select a Default List" which is the list that all new contacts will be added to by the integration. Once you've selected your list click "Save".