To authenticate with SoftLayer requires at least a `username` and `api_key` for authentication. It can also optionally take a `timeout` and `endpoint_url` parameter however these are optional and will use standard defaults if not provided.
To maintain compatibility with existing softlayer CLI services these can also be provided by the `SL_USERNAME` and `SL_API_KEY` environment variables or specified in the `~/.softlayer`, but this is discouraged. More information about these methods can be found at [the softlayer-go library documentation](https://github.com/softlayer/softlayer-go#sessions).