Question Has anyone gotten APPTUTTi integration working?

It says you have to use their ad SDK to make it work but when I import their "freemium with ads" package into an empty Unity project it has the following 4 errors:

Assets\ATSDK\ApptuttiSDK.cs(136,58): error CS0246: The type or namespace name 'IPayListener' could not be found (are you missing a using directive or an assembly reference?)
Assets\ATSDK\ApptuttiSDK.cs(161,51): error CS0246: The type or namespace name 'IQueryListener' could not be found (are you missing a using directive or an assembly reference?)
Assets\ATSDK\ApptuttiSDK.cs(187,73): error CS0246: The type or namespace name 'IConsumeListener' could not be found (are you missing a using directive or an assembly reference?)
Assets\ATSDK\ApptuttiSDK.cs(212,64): error CS0246: The type or namespace name 'IConsumeListener' could not be found (are you missing a using directive or an assembly reference?)

I want to get my app into China and this seemed like a great way but I haven't been able to get anywhere on it yet. I'm using Unity 2020.3.8f1.