How do i send an api key in a request header

I'm using a service that provides an api to get data out of our online, hosted database. I've never called data this way from VBA and am wondering how to do it.
I have an api key, username, password but am not sure how to put code together to make it work.
Code I've put together is below:

Dim httpreq As New MSXML2.XMLHTTP60, myurl As String
myurl = "https://cowtown.breezechms.com/api/people"
httpreq.Open "GET", myurl, False
httpreq.setRequestHeader "Content-Type", "application/json"
httpreq.setRequestHeader "dduck", "abc123"
httpreq.send
MsgBox (httpreq.responseText)

The MsgBox just kicks back the following response.

"Permission Denied - API key () does not match subdomain (cowtown)"
emeschkeAsked:
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
based on the documentation it only provide you sample in PHP.

List People
https://cowtown.breezechms.com/api/#people

are you able to contact to their site support to ask for further assistance? without proper documentation we will not know what to be passed to the web service.
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emeschkeAuthor Commented:
I got a hold of their support and found that the username was Api-key and then to use your api key as the password. Things work well now!
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emeschkeAuthor Commented:
Thanks for your help.
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