@Retention(value=SOURCE) public static @interface BillingClient.BillingResponse
public static final int SERVICE_TIMEOUT
public static final int FEATURE_NOT_SUPPORTED
public static final int SERVICE_DISCONNECTED
E.g. Play Store could have been updated in the background while your app was still
running. So feel free to introduce your retry policy for such use case. It should lead to a
call to BillingClient.startConnection(com.android.billingclient.api.BillingClientStateListener) right after or in some time after you received this code.
public static final int BILLING_UNAVAILABLE
public static final int ITEM_UNAVAILABLE
public static final int DEVELOPER_ERROR