func (a serviceOAuthAuthentication) authenticate(req *http.Request, endpoint string, params []byte) error {
	return nil // No additional headers needed for service OAuth requests
}
func (a serviceOAuthAuthentication) authenticate(req *http.Request, endpoint string, params []byte) error {
	return nil 
}
func ( a serviceOAuthAuthentication ) authenticate ( req * http . Request , endpoint string , params [ ] byte ) error { return nil // No additional headers needed for service OAuth requests }
// Service OAuth authentication requires no additional headers to be sent. The
// Coinbase Public Certificate is set as a TLS config in the http.Client
Service OAuth authentication requires no additional headers to be sent . The Coinbase Public Certificate is set as a TLS config in the http . Client