The linker tag set up example:

The trigger that needs adding is named 'All Pages', which is already predefined in triggers list.

Before creating the tag, we should get Conversion ID and Conversion Label. These can be found when creating new conversion, in 'Set up tag' section:

Now we will create a tag, which allows tracking registration conversions. Our app is firing many different events to GTM and event name when user registers is registrationFinished. We can create a custom trigger for this:

Now this trigger will always be triggered once user creates a new account. Next step is to create a tag, which should look like this: