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Accesing PublisherQueryLanguageService via Google Ad Manager api

I am seeking some info as to how to query publisherquerylanguageservice in google ad manager api and update records in SF.

I have gone over multiple docs , have seen bunch of videos, but am still utterly confused as to what should be the calling criteria/api for accessing the ad manager data.

Steps I have completed so far :
1. Have an ad manager account.
2. Created a projected in google console
3. Created credentials with correct redirect uri to get client secret/id
4. Used those credentials to get "bearer" token both in POSTMAN and OAuth playground.
5. And now using the token, when I calling api https://www.google.com/apis/ads/publisher/v202002/PublisherQueryLanguageService?wsdl , I am getting a success 200.

Beyond this, I am not making any headway as to what I should be querying and how to access the data. I am not even sure what's the correct api and format I should be using.
The more google articles I read, the more confused I am getting.
And most of the StackExchange and DeveloperForum links are targeted to getting a token rather than what needs to be done after getting the token.

If anyone has exprience, could you provide guidance as to how I can retrieve data.
The PublisherQueryLanguageService is huge and the data I am interested in is under https://developers.google.com/ad-manager/api/reference/v202002/PublisherQueryLanguageService#Programmatic_Buyer

Any help in this regards is appreciated.