'Play Billing v4 - Checking if SKU is purchased on onCreate

I am trying to make a donation iap that unlocks different themes for the app. Because of that, I am trying to query if the donation SKU is purchased before setting the content view. Is that possible? I've tried this so far:

fun onCreate(savedInstanceState: Bundle?){
    billingRepository.isPurchased(SKU_COFFEE).observe(this){ premium: Boolean ->
        if(premium) setTheme(requestedTheme)
        _binding = ...
        setContentView(binding.root)
    }
}

But this leads to ANRs when the phone doesn't have access to Internet.

(The billingRepository is the one that comes from the Trivial Drive sample made by Google.)

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'Play Billing v4 - Checking if SKU is purchased on onCreate

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