To get your API key in test mode Click Here.

To setup your API key in live mode Click Here.

Log in to Dashboard with the appropriate credentials.
From left menu click on settings and then API.
To generate new API token or update your token, click on GENERATE/UPDATE button. API token will be available as shown above. However, you can reveal token by clicking on show button. You may copy the token by clicking on copy button. Currently system will allow to generate 1 token per user.