googleplaybilling

Hello, i have some apps published which include in-app subscriptions, i want to update them now and in order to do that, it is required to update to a newer version of GooglePlayBilling because the version 3 that i used till now is deprecated. I have followed all the steps from here , including...

I get this error in Crashlytics Fatal Exception: java.lang.RuntimeException Unable to start activity ComponentInfo{appname/com.android.billingclient.api.ProxyBillingActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.IntentSender...

Good morning everyone, in my App there are 5 different types of subscription, each with different prices but all lasting one month. I should make a function that allows the user to upgrade a service by purchasing a different subscription: To go from "pui_cloud_lvl1" (1.99 €) to...