curl --request GET \
  --url https://api.carecycle.ai/v2/custom-fields/{id} \
  --header 'x-api-key: <api-key>'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "clientId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "recordType": "customers",
  "fieldKey": "<string>",
  "fieldLabel": "<string>",
  "fieldDescription": "<string>",
  "fieldType": "text",
  "isRequired": true,
  "options": [
    "<string>"
  ],
  "validationRules": "<string>"
}