code: func Create(c *messagebird.Client, originator string, recipients []string, msgParams *Params) (*Message, error) {
  	params, err := paramsForMessage(msgParams)
  	if err != nil {
  		return nil, err
  	}
  
  	params.Set("originator", originator)
  	params.Set("recipients", strings.Join(recipients, ","))
  
  	mmsMessage := &Message{}
  	if err := c.Request(mmsMessage, http.MethodPost, path, params); err != nil {
  		return nil, err
  	}
  
  	return mmsMessage, nil
  }
docs: // Create creates a new MMS message for one or more recipients.