You will need to create an API token inside your DigitalOcean account, this is fairly easy.

Start by logging in into digitalocean.com and go to "API" in the left sidebar. Make sure you press "Tokens/Keys" and then "Generate New Token".

Important: You will have to make sure your API key has access to Read & Write permissions, if you want extra security you can allow this API address as only access to that token: -Hidden-