“Support” means that you can use the unique features of Android 34 in Unreal Engine, it doesn’t mean that it is the only version that you can build on.
So, you can use any other version of Unreal like 5.2 which works very well (unlike 5.3 and 5.4 that are broken in many ways).
Google Pad is compatible with 5.4 too. It’s a default plugin, you can simply activate it in the plugin manager inside the Unreal Editor.
Make sure to also activate it under the “Plugins” section of your project settings.
As Lucas said, the 5.4 version is broken, so you need to download and replace the 2 files that you can find on my other post here : https://forums.unrealengine.com/t/update-android-play-billing-5-0/1257109/36
My recommandation would be to only use the 5.2 version, it’s a clear version and you don’t have to replace anything, so it can be easier for you.
Anyway, if you want to use IAP, you must use 5.2 with the plugin “TDS Hero” (or any other plugin that does the same thing, TDS was “free for the month”, so maybe you already own it and won’t have to pay for another one).
IAP won’t work on 5.4 because of an engine bug that Epic refuses to fix, and they won’t work on 5.2 without the plugin because the engine uses deprecated libraries.
If you don’t need IAP, you are good to go 