In order to make any Content Management API (CMA) requests, you need to first obtain a full-access API token. To retrieve this API token, enter your project administrative area (ie. http://your-project.admin.datocms.com) and go to the  Settings > API Tokens section:

Once you have the API Token, you need to pass it as a header in each Content Management API request:

curl \
  -H 'Authorization: Bearer YOUR-API-TOKEN' \
  -H 'accept: application/json' \
  https://site-api.datocms.com/site