curl --request POST \
  --url https://platform.thena.ai/v1/custom-field/delete \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "fields": [
    {
      "fieldId": "<string>",
      "version": 123
    }
  ]
}'

{
  "data": null,
  "status": true,
  "message": "Custom fields deleted successfully!",
  "timestamp": "2024-01-15T10:30:00Z"
}