To count the number of payments you received and revenue from your email campaign, you need to use MailBluster Developer API. Through developer API, it is possible to create order. If you have created an order based on a campaign, then it will be counted as sell in MailBluster Campaign Report section. And the provided Total Price will be counted as Revenue. Learn details about Order API from here: https://app.mailbluster.com/api-doc/orders
The following screenshare has been taken from MailBluster Reports showing Revenue and Sell of an order of a certain campaign.
Order generated through Developer API
Order details of a lead