The process for this is straightforward. Please follow these directions on how to do this:
- Login into the CMS and select an ad unit you plan on using.
- Grab embed code for the unit and make sure that the "Serve Outstream through DFP" is enabled.
- Login into your DFP account and create a 1x1 size line item that you will use for this purpose.
- Create a custom 1x1 size creative (third party will also work) under this line item and paste the unit embed code into it.
- When setting the creative make sure that the "Serve into SafeFrame" option is un-checked.
- Save your creative in DFP and double-check your targeting settings.
- Generate your async DFP 1x1 tag from DFP and use it as suggested by DFP.