request to the endpoint staging

request.json

{
  "data": {
    "attributes": {
      "first_name": "Carley"
    },
    "relationships": {
      "object-custom-fields": {
        "data": [
          {
           "attributes": {
           	 "field":"custom_date",
           	 "value": "2019-18-07"
            } 
          }
        ]
      }
    }   
  }
}