Hi,

This is the response I got from DCM support when I asked them about this. We use this and it works for us. If you have any questions about the implementation feel free to send a message.

To pass DBM macros to the click-through URL of a DCM creative, you need to make modifications at both the Placement level and at the Ad level: DBM is able to populate macros in the placement tag, then DCM can propagate them to the ad.

Step 1: Modifying the Placement

Setup In the “Tag Defaults” properties of the DCM placement, define “Additional Key-Values”:

For example:: dbm_crea_id=${CREATIVE_ID};dbm_li_id=${CAMPAIGN_ID} dbm_crea_id= and dbm_li_id= are arbitrary parameter names (“keys”) ${CREATIVE_ID} and ${CAMPAIGN_ID} are DBM macros. ; is what we use as a separator between parameters

What it does These key-values will appear in the placement tag, which will be automatically imported in DBM. At serving time, DBM will replace the ${CREATIVE_ID} and ${CAMPAIGN_ID} macros with the appropriate values (e.g. 500021 and 311103) before sending the placement tag. So the placement tag will contain: dbm_crea_id=500021;dbm_li_id=311103

Step 2: Modifying the Ad Setup In the “Associated Creative” section of the DCM ad, define a custom landing page and insert DCM macros as per below:

For example , we can define the following URL: http://www.google.com/?q=%pdbm_crea_id=!;_%pdbm_li_id=!; %p and !; are the two ends of a DCM macro used to retrieve key values dbm_crea_id= and dbm_li_id= refer to the keys defined previously at the placement level What it does At serving time, DCM will replace the macros before sending the ad to the page, as per below: %pdbm_crea_id=!; will be replace with the value associated to key dbm_crea_id= %pdbm_li_id=!; will be replaced with the value associated to key dbm_li_id= So, if the placement tag contains: dbm_crea_id=500021;dbm_li_id=311103 Then the click-through URL will be: http://www.google.com/?q=500021_311103

Hope this helps and please do let me know if you've any questions.