Google In App Billing 区分用户帐户

Question

I'm developing an app that contains In App Billing non consumable product (Life time Subscription).
User has one email associated with Play Store on his device.

Scenario:
User A create new account using user1@test.com and purchase Lifetime Subscription and logout.
User B create new account using user2@test.com and trying to purchase.
but he get response BillingClient.BillingResponse.ITEM_ALREADY_OWNED .

How do i differ each user to buy item?
I'm using 'com.android.billingclient:billing:2.2.1'

Answer 1

If you are using Firebase authentication then you can get user's unique id using String uid = FirebaseAuth.getInstance().getCurrentUser().getUid() and you can use this Id at the time of purchase like -

BillingFlowParams billingFlowParams = BillingFlowParams.newBuilder()
                .setSkuDetails(skuDetails).setObfuscatedAccountId(uid)
                .build();
        BillingResult billingResult = billingClient.launchBillingFlow(activity, billingFlowParams);

Also in your database use this as unique identifier to check whether user has the subscriotion or not.