code: func (s *RegistrarService) RenewDomain(accountID string, domainName string, request *DomainRenewRequest) (*domainRenewalResponse, error) {
  	path := versioned(fmt.Sprintf("/%v/registrar/domains/%v/renewals", accountID, domainName))
  	renewalResponse := &domainRenewalResponse{}
  
  	resp, err := s.client.post(path, request, renewalResponse)
  	if err != nil {
  		return nil, err
  	}
  
  	renewalResponse.HttpResponse = resp
  	return renewalResponse, nil
  }
docs: // RenewDomain renews a domain name.
  //
  // See https://developer.dnsimple.com/v2/registrar/#register