code: func Create(c *messagebird.Client, msisdn string, reference string) (*HLR, error) {
  	requestData, err := requestDataForHLR(msisdn, reference)
  	if err != nil {
  		return nil, err
  	}
  
  	hlr := &HLR{}
  
  	if err := c.Request(hlr, http.MethodPost, path, requestData); err != nil {
  		return nil, err
  	}
  
  	return hlr, nil
  }
docs: // Create creates a new HLR object.