We do have a document covering possible link syntax: 

In short, there is the DEFAULT format:
https://prf.hn/click/camref:XXXX

You can modify the default to include PUBREF, ADREF and/or Deeplink to a unique Destination:
Pubref: http://prf.hn/click/camref:XXXX/pubref:newcastle

Adref: http://prf.hn/click/camref:XXXX/ar:london
Deeplink: http://prf.hn/click/camref:XXXX/destination:http://www.advertiser.com

OR combine them:
All 3 parameters: https://prf.hn/click/camref:XXXX/pubref:newcastle/ar:london/destination:http://www.advertiser.com
Only pubref/adref: https://prf.hn/click/camref:XXXX/pubref:newcastle/ar:london
Only adref and deeplink: https://prf.hn/click/camref:XXXX/ar:london/destination:http://www.advertiser.com
Only pubref and deeplink: https://prf.hn/click/camref:XXXX/pubref:newcastle/destination:http://www.advertiser.com

It matters the ORDER of the used parameters:

• [Default Tracking link with Camref] THEN [pubref] THEN [adref] END WITH [Deeplink]

Further are able to track with Creative tracking, those tracking links include Creativeref:

• /creativeref:XYZ1234

The Creativeref tracking links contains the destination, BUT can have pubref/adref added AFTER the 'creativeref':

• /creativeref:XYZ1234/pubref:newcastle/ar:london

For all links here, across all networks, the "%" is a placeholder, matching 0 or more characters. It's typically the value of a URL parameter, and is also used in "http%://" to indicate that both "http" and "https" are possible.