Is it a requirement to use the integration plugin with unreal engine?

I want to know if I have rights to not use the integration with unreal engine or it is a requirement?
I don’t want to import banks and I also don’t want to code with the fmod integration nodes, I just want to mix sounds with fmod and import the sounds to unreal engine without the integration plugin.

Yes, you’re allowed to use FMOD Core with Unreal without using the official FMOD Unreal integration. Note that you’re still subject to the same licensing requirements whether you use the FMOD Unreal integration or just FMOD Core directly.