In-app purchase Error while retrieving information from server [DF-AA-20]

Question

i'm trying to enable in app billing. I've created In-app-products on my google play console and got my License key. When i try to purchase product. I get this image error.

Here is the code i use to create BillingProcessor.

bp = new BillingProcessor(this, LICENSE_KEY, MERCHANT_ID, new BillingProcessor.IBillingHandler() {
        @Override
        public void onProductPurchased(@NonNull String productId, @Nullable TransactionDetails details) {
            showToast("onProductPurchased: " + productId);
            updateTextViews();
        }
        @Override
        public void onBillingError(int errorCode, @Nullable Throwable error) {
            showToast("onBillingError: " + Integer.toString(errorCode));
        }
        @Override
        public void onBillingInitialized() {
            showToast("onBillingInitialized");
            readyToPurchase = true;
            updateTextViews();
        }
        @Override
        public void onPurchaseHistoryRestored() {
            showToast("onPurchaseHistoryRestored");
            for(String sku : bp.listOwnedProducts())
                Log.d(LOG_TAG, "Owned Managed Product: " + sku);
            for(String sku : bp.listOwnedSubscriptions())
                Log.d(LOG_TAG, "Owned Subscription: " + sku);
            updateTextViews();
        }
    });

LICENSE_KEY is my license key from google play console, and MERCHANT_ID is null.

This is how i buy items.

bp.purchase(this,PRODUCT_ID);

Where PRODUCT_ID is product1 which i use in my google play console, here is the example of my in-app products.

Any idea how to fix this ? There is only one stackoverflow question with DF-AA-20 problem which has no answers. And there is no information on the internet about it. I have tried to use emulator and my android phone.

Answer 1

DF-AA-20 means your app is not published in any way on the Play store. This is normally because either:

• you haven't published it yet. To test In-App Billing it must be pushed to at least alpha. See the testing IAB docs for more information
• your app or developer account has been banned/suspended for abuse
• you make some change to your package name/applicationId, so that in your apk it doesn't match the one on Play. Developers sometimes do this with build flavors

Answer 2

Oh, I had this exception when I tested buys in my product with different sku.
Check your sku!
Sku must be not CAPS! Only [a-z][0-9]!