'httr' Looker API Documentation

Is there any documentation on accessing the Looker API with the ‘httr’ R package?  I need to access a Looker instance that someone has setup and have been using LookR but that package really isn’t maintained.

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I get a 200 response with this but I’m not seeing an authorization token anywhere.

get_req <- GET(
Sys.getenv('looker_link'),
add_headers(
"client_id" = Sys.getenv("looker_client_id"),
"client_secret" = Sys.getenv("looker_api_key")
)
)