Curl in Linux format as API Help docs show only Win32 examples.
Within the API help documentation Curl syntax is based on the win32 version of curl. But the syntax is slightly different in Linux; escape characters for the double quotes in the header change to backslashes instead of double quotes.
So try this command syntax,
curl -H "Authorization: WRAP access_token=\"client=ConsumerSecret&user_token=UserToken\"" -k https://api.dovico.com/employees/?version=1
Within linux, it also seems that the “version” parameter has to be the first parameter in the query string.
curl --header "Authorization: WRAP access_token=\"client=xxx&user_token=yyy\"" -k https://api.dovico.com/TimeEntries/?version=1&daterange=2012-10-01+2011-12-14
(thank you Francois for also bringing this to my attention)