lib/createsend/createsend.rb
def set_primary_contact(email)
      options = { :query => { :email => email } }
      response = put("/primarycontact.json", options)
      Hashie::Mash.new(response)
    end
def set_primary_contact(email)
      options = { :query => { :email => email } }
      response = put("/primarycontact.json", options)
      Hashie::Mash.new(response)
    end
Set the primary contect for the account.