code: func CreateHLR(c *messagebird.Client, phoneNumber string, params *Params) (*hlr.HLR, error) {
  	requestData := requestDataForLookup(params)
  	path := lookupPath + "/" + phoneNumber + "/" + hlrPath
  
  	hlr := &hlr.HLR{}
  	if err := c.Request(hlr, http.MethodPost, path, requestData); err != nil {
  		return nil, err
  	}
  
  	return hlr, nil
  }
docs: // CreateHLR creates a new HLR lookup for the specified number.