RGAF09 + Guadeloupe 1988 height - EPSG:9531

WKT

HVCOORDSYS["RGAF09_and_Guadeloupe_1988_height", 
	GEOGCS["GCS_RGAF09", 
		DATUM["Reseau_Geodesique_des_Antilles_Francaises_2009", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["IGN_1988", 
		VDATUM["IGN_1988"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["RGAF09_and_Guadeloupe_1988_height", 
	GEOGCRS["GCS_RGAF09", 
		DATUM["Reseau_Geodesique_des_Antilles_Francaises_2009", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	VERTCRS["IGN_1988", 
		VDATUM["IGN_1988"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "9531"]]

Data from @esri/proj-codes

{
  "wkid": 9531,
  "latestWkid": 9531,
  "pcsWkid": 0,
  "gcsWkid": 5489,
  "vcsWkid": 5757,
  "macro": "PE_HVC_RGAF09_GUADELOUPE_1988_HEIGHT",
  "name": "RGAF09_and_Guadeloupe_1988_height",
  "wkt": "HVCOORDSYS[\"RGAF09_and_Guadeloupe_1988_height\",GEOGCS[\"GCS_RGAF09\",DATUM[\"Reseau_Geodesique_des_Antilles_Francaises_2009\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"IGN_1988\",VDATUM[\"IGN_1988\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"RGAF09_and_Guadeloupe_1988_height\",GEOGCRS[\"GCS_RGAF09\",DATUM[\"Reseau_Geodesique_des_Antilles_Francaises_2009\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],VERTCRS[\"IGN_1988\",VDATUM[\"IGN_1988\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"9531\"]]",
  "description": "RGAF09 + Guadeloupe 1988 height",
  "authority": "EPSG",
  "version": "10.013(13.2.0)",
  "deprecated": "no",
  "areaname": "Guadeloupe - Grande-Terre and Basse-Terre - onshore",
  "extent": {
    "slat": 15.88,
    "nlat": 16.55,
    "llon": -61.85,
    "rlon": -61.15
  }
}