code: func NewClient(host string, version string, client *http.Client, httpHeaders map[string]string) (*Client, error) {
  	return NewClientWithOpts(WithHost(host), WithVersion(version), WithHTTPClient(client), WithHTTPHeaders(httpHeaders))
  }
docs: // NewClient initializes a new API client for the given host and API version.
  // It uses the given http client as transport.
  // It also initializes the custom http headers to add to each request.
  //
  // It won't send any version information if the version number is empty. It is
  // highly recommended that you set a version or your client may break if the
  // server is upgraded.
  // Deprecated: use NewClientWithOpts