code: func (h *Client) AnonymizeIP(anonymizeIP bool) *Client {
  	h.anonymizeIP = anonymizeIP
  	h.anonymizeIPSet = true
  	return h
  }
docs: // When present, the IP address of the sender will be anonymized.
  // For example, the IP will be anonymized if any of the following
  // parameters are present in the payload: &aip=, &aip=0, or
  // &aip=1