Macao height - EPSG:8434

WKT

VERTCS["Macao_height", 
	VDATUM["Macao_Height_Datum"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Macao_height", 
	VDATUM["Macao_Height_Datum"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "8434"]]

Data from @esri/proj-codes

{
  "wkid": 8434,
  "latestWkid": 8434,
  "macro": "PE_VCS_MACAO_HT",
  "name": "Macao_height",
  "wkt": "VERTCS[\"Macao_height\",VDATUM[\"Macao_Height_Datum\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Macao_height\",VDATUM[\"Macao_Height_Datum\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"8434\"]]",
  "description": "Macao height",
  "authority": "EPSG",
  "version": "9.2.2(10.8.0)",
  "deprecated": "no",
  "areaname": "Macao",
  "extent": {
    "slat": 22.06,
    "nlat": 22.23,
    "llon": 113.52,
    "rlon": 113.68
  }
}