In order to integrate with Google DBM, head over to Project Settings and click on Integrations on the lefthand side and click Connect.

Next, enter your DoubleClick Advertiser ID in the text field that appears, and then click Continue.

This will trigger a pairing request to the Support Team.
Next you have to change the yldr.init in the base Tag by changing: 

_yldr.init("<api_key>"); 

to

_yldr.init("<api_key>", {sync: ["google"]}); 

This starts the user ID syncing process with Google DBM.
 
When Google has authorized the pairing, your integration is all set up and you'll be able to send custom audiences to Google DoubleClick Manager. A custom audience will be accessible 2 to 4 hours after exporting it to Google.

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