On Ascendix Search setup Mailchimp users have a dedicated tab to support enhanced behaviour by configuring the Flows to be triggered after successful or failed campaigns. 

In the lookups users can see the list of the flows they have created themselves or have been shared with.

Once the campaign failed or succeeded, the chosen flow is triggered. 

Data mapping section allows choosing the fields to map the data to so that the information from Salesforce records is used for the campaigns and is visible on Mailchimp account after successful mailout. 

Object Name - shows the list of the email-compatible object. 
to set an object as an email-compatible, navigate to Email tab on Ascendix Search setup, add configure that object there. 

Choose which fields on the chosen object will be used for First Name, Last Name and Phone. 

Map Address fields if you want that contact information to be sent to Mailchimp for the the given campaign. 

note: Mailchimp does not allow partial input for the address information. If you want to send address data of your recipients to Mailchimp, please make sure the mapping is performed, and the records chosen for the campaign contain that data. The campaigns with missing address information on the recipients record pages (when the mapping for the addresses is performed), will fail. 

Save the changes and navigate to Mailchimp menu to create your campaign.