Read the FAQ
and get a good understanding first. For technical documentation and sample code,
download this ZIP file, extract to a new folder and
read the README.txt file! There is NO API to be called at our server. Instead our
server will call your webhook endpoint, when a valid data is posted by your user
via the LLL-SSS utility. That endpoint will get some data via a POST request.
It is all well explained in that zip file.