API - getting startet

I must admit - despite having integrated to other oauth solutions that i can't find out how to get started with Adobe Sign API.

The terminologies confuses me:

I've created both an Applicaton ID / Client Secret token ... 

(API Application) AND an "Personal Preferences - > Access Token"

But how do I get a access_token WITHOUT a popup window?

I want to automate post of request of signing documents and don't want a user to accept each time.

I looked at :

https://secure.adobesign.com/public/oauth?
    redirect_uri=https://myserver.com&
    response_type=code&
    client_id=CBAThIsIsNoTaReAlmPBvPF&
    scope=user_login:self+agreement_send:account

 Which - in a browser - gave me a popup ... 
I've already "granted access on the API application ID ... 
Is there no way to provide the Application ID + secret ... and get an access token directly? 

POST http://api.adobesign.com/oauth/token?
    code=CBNCKBAThIsIsNoTaReAlcs_sL4K32wCzs4N&
    client_id=CBAThIsIsNoTaReAlmPBvPF&
    client_secret=319UThIsIsNoTaReAl2-4OxkVo9ycU&
    redirect_uri=https://myserver.com&
    grant_type=authorization_code HTTP/1.1

This one requires a "code" .. .what is "code" ??? because I DO see client_id and client_secret .. .eventhough the interface in Adobe Sign does NOT mention an client_id .. but an application_ID ... 

Can anyone help me getting started?

Kind Regards

Søren Rehné