demo: Google Pay and Apple pay crashing #11

I am trying to run the demo app of this repo and when trying to go to the Google Pay / Apple pay section of the app, it is crashing with the following messages:

Android - Google Pay:

System.err: An uncaught Exception occurred on "main" thread.
System.err: Calling js method onClick failed
System.err: Error: Building UI from XML. @plugin-demos/google-pay.xml:14:11
System.err: > Module 'GooglePayBtn' not found for element 'GooglePayBtn'.
System.err: > instanceType is not a constructor

iOS - Apple Pay:

***** Fatal JavaScript exception - application has been terminated. *****
NativeScript encountered a fatal error: Uncaught Error: Building UI from XML. @plugin-demos/apple-pay.xml:11:11

Module 'ApplePayBtn' not found for element 'ApplePayBtn'.
instanceType is not a constructor

I am on NativeScript CLI 8.1.4