PFAuthenticationGetEntityRequest request{};
    XAsyncBlock async{};

    // Add your own error handling when FAILED(hr) == true
    HRESULT hr = PFAuthenticationGetEntityWithSecretKeyAsync(
        serviceConfigHandle,
        secretKey, // title specific secret key
        &request,
        &async
    );

    hr = XAsyncGetStatus(&async, true); // This is doing a blocking wait for completion, but you can use the XAsyncBlock to set a callback instead for async style usage

    PFEntityHandle entityHandle;
    hr = PFAuthenticationGetEntityWithSecretKeyGetResult(
        &async,
        &entityHandle
    );

    XAsyncBlock async{};
    PFSegmentsAddPlayerTagRequest request{};
    addSegmentRequest.PlayFabId = "ABCDEF123456";
    addSegmentRequest.tagName = "tagName";
    HRESULT hr = PFSegmentsServerAddPlayerTagAsync(entityHandle, &request, &async);
    hr = XAsyncGetStatus(&async, true);