Can I purchase multiple items at one time through Google Play in Android App?

Question

In my mind, I can only puchase one item at one time in Google App.

The Code A is from the project play-billing-samples, you can see here.

purchases: MutableList<Purchase> maybe exist multiple items, it seems that I can purchase these items simultaneously through Google Play, right?

Code A

override fun onPurchasesUpdated(
        billingResult: BillingResult,
        purchases: MutableList<Purchase>?
) {
    when (billingResult.responseCode) {
        BillingClient.BillingResponseCode.OK -> {
            // will handle server verification, consumables, and updating the local cache
            purchases?.apply { processPurchases(this.toSet()) }
        }
        BillingClient.BillingResponseCode.ITEM_ALREADY_OWNED -> {
            // item already owned? call queryPurchasesAsync to verify and process all such items
            Log.d(LOG_TAG, billingResult.debugMessage)
            queryPurchasesAsync()
        }
        BillingClient.BillingResponseCode.SERVICE_DISCONNECTED -> {
            connectToPlayBillingService()
        }
        else -> {
            Log.i(LOG_TAG, billingResult.debugMessage)
        }
    }
}

Answer 1

An user can own the same in-app item only once, but he can own different items at the same time.

Other solution is to consider the item as consumable:

if billingClient.consumeAsync() is called at the end of the purchase process then he can buy the same item again, but you have to keep track of how many times he bought it by your own means, probably through a backend server.