Weird looking affiliate link arguments

If you click on the affiliate link in an incognito window then it appends the following arguments (in bold) automatically to the URL:

I am not sure what these arguments (redirect_back and clickthrough_id) are for. Does anyone here know? Or could someone from @Envato please address this?

I tried looking for documentation on these arguments but could not find any.

I would much appreciate your response. Thank you.

It’s for the cookies, there’s nothing to worry