How to upgrade/downgrade subscriptions in Android InAppBilling?

Question

I spent a week looking for solution to upgrade/downgrade subscriptions on Android InAppBilling.

There\'s a reference page about this function: http

Answer 1

at first thanks for aidl file.

But for me it is not working. I always get an error code 5:

Invalid arguments provided to the API. This error can also indicate that the application was not correctly signed or properly set up for In-app Billing in Google Play, or does not have the necessary permissions in its manifest

I don't think that the permissions are wrong or it is not correctly signed as all other payment requests work.

This is my code:

List subs = new ArrayList<>();
subs.add(current_sub);
buyIntentBundle = mService.getBuyIntentToReplaceSkus(3, "package", subs,
       key, "subs", getResources().getString(R.string.developer_payload));

How do you execute an upgrade request or do you see any error in my request?

Thanks Solidus