The flow should be :

  • Splash Screen
  • Main screen :
  • label / popup (I would vote for just a label) "Registering ..." (showed while the device register to UPS)
  • label "Registration successfull" if the registration is ok
    *label "Registration Failed" if registration is nok
  • simple list where Push Notification stack up

So , IMO no button at all are needed.

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