Here is the instructions from postback settings to tracking settings for each network of GoogleAdWords (GDN, Google Search, TrueView and UAC). This is the recommended procedures but you can do the tracking settings for each campaign first.
1. Issue a conversion ID/label.
3. Do tracking settings for each campaign.
*Procedures for GoogleAdWords depend on the networks and OS.
Refer to the following URL and do the tracking settings for the desired network.
Android:
- GDN (Google Display Network / AdMob)
iOS: