Missing something in GET by client order ID

I seem to be missing something, probably obvious. The documentation says the endpoint for requesting an order by the client’s order ID is:

GET /v2/orders:by_client_order_id

Is the order id enclosed with {} brackets? Is there another slash? None of these work:

https://paper-api.alpaca.markets/v2/orders:by_client_order_id/{“123456”}
https://paper-api.alpaca.markets/v2/orders:by_client_order_id=“123456”
https://paper-api.alpaca.markets/v2/orders:by_client_order_id=123456

api = tradeapi.REST(API_KEY, SECRET_KEY, APCA_API_BASE_URL, api_version=‘v2’)
client_order_id = ‘123456’
my_order = api.get_order_by_client_order_id(client_order_id)

I’m using Access VBA. The code snippet is

XMLHTTP.Open "GET", sReq, False
'XMLHTTP.setRequestHeader "Content-Type", "application/json; charset=UTF-8"
XMLHTTP.setRequestHeader id_header_name, id_key
XMLHTTP.setRequestHeader secret_header_name, secret_key
XMLHTTP.Send
byteData = XMLHTTP.ResponseBody

with sReq = https://paper-api.alpaca.markets/v2/orders:by_client_order_id=“123456”