I want to upload files directly from my website to my Office 365 Onedrive's account via PHP

Question

Hey there!

I want to upload files from my website to my Onedrive for business account via PHP. I have a little experience with PHP and I think I can manage, but I´m a little lost on where to begin, I found a couple of threads in stackoverflow talking about this but they are either too old and obsolete or they refer to a regular Onedrive account which is different from the business version.

Could you point me to the right direction?

Apparently I have to register an app with Microsoft and with those credentials I can start the whole process. Where and how do I do that?

We are a school and we have Office 365 A1.