code: func apiKeyAuth(key string, secret string) *apiKeyAuthentication {
  	a := apiKeyAuthentication{
  		Key:     key,
  		Secret:  secret,
  		BaseUrl: config.BaseUrl,
  		Client: http.Client{
  			Transport: &http.Transport{
  				Dial: dialTimeout,
  			},
  		},
  	}
  	return &a
  }
docs: // ApiKeyAuth instantiates ApiKeyAuthentication with the API key & secret