Easy way to connect to the API?

Easy way to connect to the API?

Hello
I'm a bit stuck with the API. While I generally love the system, connecting to the API is very hard! ... well I haven't managed to get it working yet and I'm using make.com to abstract the connection to Zoho Inventory. This is a bit a bummer.

Since this is just my server talking to Zoho I don't need the oauth thing. I would be perfectly fine to have some token authorization, but I haven't found any working tutorial yet. 

Can anybody help?
Regards