How to verify purchase for android app in server side (google play in app billing v3)

Question

I have a simple app (needs user login with account). I provide some premium features for paid users, like more news content.

I need to record if the user has bought

Answer 1

Complete example of using Google API Client Library for PHP:

1. Setup your Google Project and access to Google Play for your service account as described in Marc's answer here https://stackoverflow.com/a/35138885/1046909.

2. Install the library: https://developers.google.com/api-client-library/php/start/installation.

3. Now you are able to verify your receipt the following way:

   $client = new \Google_Client();
   $client->setAuthConfig('/path/to/service/account/credentials.json');
   $client->addScope('https://www.googleapis.com/auth/androidpublisher');
   $service = new \Google_Service_AndroidPublisher($client);
   $purchase = $service->purchases_subscriptions->get($packageName, $productId, $token);
   

   After that $purchase is instance of Google_Service_AndroidPublisher_SubscriptionPurchase

   $purchase->getAutoRenewing();
   $purchase->getCancelReason();
   ...