gistfile1.txt

$ curl -v "https://api.xero.com/api.xro/2.0/Accounts"
> GET /api.xro/2.0/Accounts HTTP/1.1
> Host: api.xero.com
> User-Agent: curl/7.58.0
> Accept: */*
> 
< HTTP/1.1 401 Unauthorized
< Content-Type: text/html; charset=utf-8
< Strict-Transport-Security: max-age=31536000
< WWW-Authenticate: OAuth Realm="api.xero.com"
< Content-Length: 95
< Expires: Wed, 22 Jan 2020 05:56:23 GMT
< Cache-Control: max-age=0, no-cache, no-store
< Pragma: no-cache
< Date: Wed, 22 Jan 2020 05:56:23 GMT
< Connection: keep-alive
< X-Client-TLS-ver: tls1.3
< 
* Connection #0 to host api.xero.com left intact
oauth_problem=consumer_key_unknown&oauth_problem_advice=Consumer%20key%20was%20not%20recognised