Want S2S pixel tracking, Ask your account manager for this.
You can get the S2S by going to the campaign info page, and then get the code under "Sever to server pixel code", before you click onto Get Code, please enter the value for the conversion like the screen shot below.
After you clicked on to Get Code, the system will return the S2S pixel like screen shot below.
Lastly, for a landing URL, http://www.yourlandingpage.com/?yourgetvalue=[cluid], [cluid] will represent a tracking value. Your advertiser needs to store [cluid] and fire it with a pixel so we can see it in our end and track the unique user.