It is a modified version of OAuth2. I heard some feedback that it was confusing, so I wrote Basic Access Auth. It's a modified version of Bassic Access Auth as well. So I can see why it is still confusing. 

Hi Murtza,

I think it is confusing. I've written an app recently and spent a lot of time trying to work out why the OAuth2 wasn't working, only to realise that it's really just basic authentication.

Maybe documentation needs updating, and mentions of OAuth2 need removing?

@Brody, all mentions of OAuth2 are gone. I agree it can be made clearer. I think rather than saying it is either Basic Auth or OAuth2. I will just describe the custom auth we currently have. 

@Murtza

I began Marketo REST programming from last month.
My confusing step.
1. I read "Quick Start Guide for Marketo REST API".
http://developers.marketo.com/blog/quick-start-guide-for-marketo-rest-api/
2. I found a word "OAuth" in this image.

3. Traditional basic auth do not need Token. I thought this authentication is OAuth1.
4. Next, I refferd API reference "Authentication" chapter.
http://developers.marketo.com/documentation/rest/authentication/
5. Request and Response format is not OAuth1 and is similler to OAuth2.
I assumed OAuth2.

Takehiro