Identifying exact app store

Hello,
I published game to Samsung store via UDP and have an issue identifying exact installation app store. I used info from that page Service interoperability | Unity Distribution Portal | 2.0.2-preview.1 which states: “The first time your game is launched on a player’s device, UDP creates and drops a JSON file in the game’s Persistent Data Path”. From my observation this file is created only after calling some methods of Purhasing API, I’m using Unity IAP with UDP target.
Is there a way to force create file at game launch?

Thanks in advance!

The udp.json file is generated during the store initialize method, no matter success or fail. If you need to identify the app store the game was downloaded from, you can also call StoreService.StoreName.