well there is no free help on this forum but i can tell you the how to do it.
Get data-site-key from html with javasciprt.
Send it to their api with requested url, they mostly ask you the domain name too.
It should give you some processes id, get that with json parse.
Then send a new request at every 10 seconds with that id to get answer's token.
After that put that token to hidden text box with javascript.
you should be okay.
