Authorization: Bearer ********************X-API-Key: ********************curl --location '/agents//customfields/' \
--header 'Authorization: Bearer <token>' \
--header 'X-API-Key: <api-key>'{
"dateEffective": "2019-08-24T14:15:22.123Z",
"dateExpires": "2019-08-24T14:15:22.123Z",
"dateValue": "2019-08-24T14:15:22.123Z",
"fieldId": 0,
"fieldName": "string",
"fieldPDFName": "string",
"numberValue": 0,
"regionId": 0,
"stringValue": "string"
}