I'm trying to implement the IAP for Oculus Go/Quest with Unreal Engine (4.23.1). I've followed the documentation and set up the environment (the plugin is added in Build.cs and the "OnlineSubsystemOculus" plugin is enable in Unreal) and include the "OVR_Platform.h" in my code. The IAP items were also given on the developer dashboard. But still I can't get any of those APIs to work, such as ovr_IAP_GetProductsBySKU. Can someone share experience about the right procedure or steps for implementing IAP with UE4?
p.s. I also checked the unreal sample project provided by Oculus in that Platform SDK v17. But in that project, it doesn't use the OSSOculus APIs but just the Unreal built-in Online APIs.
Thank you in advance for any help.