type APIKey struct {
	// Key is the API Key to set on requests.
	Key string

	// Transport is the underlying HTTP transport.
	// If nil, http.DefaultTransport is used.
	Transport http.RoundTripper
}

APIKey is an HTTP Transport which wraps an underlying transport and appends an API Key "key" parameter to the URL of outgoing requests.

Deprecated: please use NewService(..., option.WithAPIKey(...)) instead.

func (t *APIKey) RoundTrip(req *http.Request) (*http.Response, error)