Magento – How to use WSDL SOAP functions and objects in Magento 2

I just had a brief look at the Magento 2 WSDL file.

Until 1.9 I used the WSDL file as part of my development (Delphi win 32) to have access to the functions, arrays, objects etc…
This was very helpful.

I already found the functions again… totally different names though, so I have to redevelop everything… which is time-consuming, but possible.

But what I haven't understood until now is the login credentials with the token system. In V1.9 I had an API-User and the corresponding password,
which I could use to get my session ID:
e.g. mage.login(myLoginParam)

I already found the extension settings in the Magento backend.
But I really don't have a clue how to submit those consumer key, secrets… etc..
I am connecting to Magento using the HTTPRIO component from Delphi.

Can anyone enlighten me?

b/r
Holger