List email marketing campaigns.
Campaigns are marketing emails that are sent out to people in Follow Up Boss. These could be one-off email blasts or automated drip emails.
As Follow Up Boss has built-in email marketing functionality and also integrates with third-party email marketing tools, this API will return information about both.
originfield specifies which email marketing tool was used for a particular email campaign. The
originIdfield will have an ID associated with the specified email marketing tool.