can i use CAS credentials(3rd party's name and password) AUTHentication when call GITLAB API instead of using token

I want to call gitlab api using 3rd party's username and password, is there ang way?

1.in the offical site, i konw we only can call gitlab api with token .

2.in the offical site, i konw we can login in gitlab with cas (using 3rd party's username and pass).

3.in the offical site, i konw we can get token with gitlab's account(username and pass).

a. I enable the gitlab's cas in my server and i can login with cas .

b. But i test and find that i cant's get access_token with 3rd party's accout(i can use this 3rd party account to login gitlab with cas)

c. Offcial site tells us we only can use token to call gitlab api.

but in my project , i want call gitlab api with 3rd party accout to auth.