Julia API Call to Alpaca trading receives HTTP/1.1 401 Unauthorized

First time asking a question here. Hoping I do this right!

I've recently heard of Alpaca for algorithmic trading, and thought it would be a cool opportunity to learn Julia and try to get an algo working! Super excited, but running into some trouble getting the initial API call to work.

I'm hung up on the initial API HTTP request for authorization. My account is set up and approved. I've been able to get it to work with the Python library: alpaca-trade-api, but have not had luck with a simple Julia HTTP GET request. Same keys, same domain, but Julia gives an "unauthorized" error.

Link to API documentation: https://docs.alpaca.markets/web-api/

Here's the code I'm using:

using HTTP
using JSON

key = Dict("APCA-API-KEY-ID" => "my_key")
secret_key = Dict("APCA-API-SECRET-KEY" => "my_secret_key")
params = merge(key,secret_key)

base_url = "https://paper-api.alpaca.markets"
endpoint = "/v1/account"
url = base_url * endpoint

api = HTTP.request(
    "GET",
    url,
    ["Content-Type" => "application/json"],
    JSON.json(params)
    )

And I get the error: "code":40110000,"message":"access key verification failed : access key not found (Code = 40110000)

Unsure if it has to do with the format in which I'm submitting my keys, but I've tried just using the dictionary as the argument, or defining "headers=params" and that didn't work either. Same error.

Curious if anyone else has experience with getting Alpaca working with Julia, or has insight into why this wouldn't be working.