Compatibility sets the optional parameter "compatibility": Select default ads with the specified compatibility. Applicable when type is AD_SERVING_DEFAULT_AD. WEB and WEB_INTERSTITIAL refer to rendering either on desktop or on mobile devices for regular or interstitial ads, respectively. APP and APP_INTERSTITIAL are for rendering in mobile apps. IN_STREAM_VIDEO refers to rendering an in-stream video ads developed with the VAST standard.
"APP" "APP_INTERSTITIAL" "IN_STREAM_VIDEO" "WEB" "WEB_INTERSTITIAL"