Any update in the contact information (first name, last name) in Maropost will not get updated in Infusionsoft. Only the subscription status of a contact will change in the below mentioned scenario:

-> Contact has unsubscribed from a campaign sent to the list used in "contact import" integration, then the status will get unsubscribed in Infusionsoft.

Note: If the contact/contacts has been unsubscribed using the API or toggle status button or any other medium in Maropost apart from the one mentioned above, then there will be no affect to the subscription of the contacts/contacts in Infusionsoft.