Spatialization, Attenuation and Occlustion. In what order?

Hi,
in what order are spatialization, attenuation and occlustion being applied?

ok, I think I found the answer in: void FMixerSourceManager::ComputePluginAudio
For anyone that is interested, it seems the applied order is:
any effects and modulation -> attenuation -> reverb-plugin -> occlusion-plugin -> HRTF-spatializer-plugin