An API Token is required to access the functionality of Sighthound Cloud.
1) Create a Sighthound Account if you haven't already done so.
2) Visit the Sighthound Cloud section of your account page and click the "New Token" button.
3) Copy the token value and use this in the X-Access-Token header of your POST requests. For more details on using the Sighthound Cloud API consult the documentation and examples.