I am using the Mailchimp module, version 7.x-3.6.
The client has asked for an extra merge field for Gender. At the moment, we just have First Name, Last Name, Username, and UID.
When I visit /admin/config/services/mailchimp/fields, I see a field_profile_mailchimp field on my profile2 main bundle. This is just a checkbox field with a value indicating the user must be included on the mailchimp list or not.
Where is the mapping between the fields on the profile2 main bundle (field_profile_name is First Name, field_profile_last_name is Last Name) and the merge fields in Mailchimp?