Where can I find the documentation for the REST API?
REST API allows promio.connect functions to be accessed by external devices, e.g.,
 Retrieving user information with various identification properties
 
 Registering users for all available channels
 
 Sending transactional mails
 
 Un-/subscribing users from/to a newsletter
 
 Managing campaigns
 
You’ll find a documentation of the REST API here: https://api.promio-connect.com/docs/