It's not clear where the Ionic code should be located in: https://access.redhat.com/documentation/en-us/red_hat_mobile_developer_services/1/html-single/using_the_push_notifications_mobile_service/index#registering-device

It is my understanding that the file should be located here: https://github.com/aerogear/ionic-showcase/blob/a93a47e3911293b06d096e5bd3da119bbb9770d4/src/app/services/push.service.ts