private fun instantiateAndConnectToPlayBillingService() {
    playStoreBillingClient = BillingClient.newBuilder(application.applicationContext)
            .enablePendingPurchases() // required or app will crash
            .setListener(this).build()
    connectToPlayBillingService()
}

private fun connectToPlayBillingService(): Boolean {
    Log.d(LOG_TAG, "connectToPlayBillingService")
    if (!playStoreBillingClient.isReady) {
        playStoreBillingClient.startConnection(this)
        return true
    }
    return false
}