![]() Could it be that the queryPurchases() is calling the local Google Play cache which can lose track of previous purchases for some reason? (cache purging, etc. However some users are lamenting the fact that sometimes the app doesn't start in paid mode, because (I debugged the code) the function queryPurchases() fails (sometimes) when the device is offline. This method works very well, even when the app starts offline. Heres how you can do just that on your phone. So my app is doing just that, calling queryPurchases() at startup and check if the SKU is present or not. To avoid accidentally buying in-app items on your Android, iPhone, or iPad, disable the in-app purchase option so that you have to verify each purchase before its confirmed. So it seems like the app doesn't need to remember anything, just call the queryPurchases() at startup and check if the SKU is present (user already paid for it) or not (user still hasn't bought the paid version of the app). To retrieve information about purchases that a user makes from your However, nowhere it is explained how to remember the payment and unlock the paid feature during the app startup. You can use the application to get an unlimited amount of free in-app purchases and game coins, lives, levels, and others. From the Google documentation perspective the job is done, they explained to you how to retrieve/purchase/and verify a user payment. This 1400 KB-sized android application is considered one of the most used in-app purchase patchers on the web. In case of payment successful proceed to verify the purchase token signature either locally (using a local copy of the Play developer's RSA public key) or remotely on my secure server with the same key. Listen to the callback onPurchasesUpdated() to get the return code (basically payment denied, payment successful or payment cancelled) and act accordingly.Call launchBillingFlow() passing the SKU of my inapp product, to initiate the Google payment process flow (Google UI, popup asking for card details etc.).Show the BUY button if the SKU appears in the result of the previous call (which means the local Google Play instance in the user's device can handle inapp products).This is just to double check the user's device is capable of managing inapp products. Retrieve the list of available SKUs (in this case, my only 1 inapp product) using the querySkuDetailsAsync() call.Through the medium of a cute robot and a companion app, 2nd through 4th graders can understand how code is created. I understand that in order to let users buy the inapp product I have to: Best Maker-Friendly Technology: LEGO Education WeDo 2.0 LEGO Education WeDo 2.0 is an educational robotics kit that introduces elementary school kids to the world of programming. I have an Android app where users can buy 1 inapp product to unlock some features. ![]()
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