If a site has no API or interface description available, Hexon offers a very basic one that can serve as a starting point. The site can adapt this interface description and extend it according to their needs.
The basic interface uses incremental updates sent by DV as JSON documents via the HTTP protocol to the webserver of the site.
The documentation does not come with sample code. The site will need to setup an endpoint for DV to communicate with.
When filling in the checklist, several questions have already been answered when using the basic interface.