This is the documentation for ConfiForms Server/Data Center app
However, this might also work for ConfiForms cloud and in most cases it does. But please see this page to understand the differences between server and cloud versions of the ConfiForms app.
Tutorial is available on ConfiForms website: http://www.confiforms.com/cfweb/howto/recovery-and-migration-api#content
API is available for all Confluence admins who have admin rights on the ConfiForms form